Geography

2010

Changes to Counties or County Equivalent Entities: 2010s

New Counties or County Equivalent Entities

• Petersburg Borough, Alaska (02-195):
  Created from part of former Petersburg Census Area (02-195) and part of Hoonah-Angoon Census Area (02-105) effective January 3, 2013; estimated population 3,203.

Deleted Counties or County Equivalent Entities

• Bedford (independent) city, Virginia (51-515):
  Changed to town status and added to Bedford County (51-019) effective July 1, 2013.

Name and/or Code Changes or Corrections for Counties or County Equivalent Entities

• Kusilvak Census Area, Alaska (02-158)
  Changed name and code from Wade Hampton Census Area (02-270) effective July 1, 2015.
• Wade Hampton Census Area, Alaska (02-270)
  Changed name and code to Kusilvak Census Area (02-158) effective July 1, 2015.
• LaSalle Parish, Louisiana (22-059)
  Name corrected from La Salle Parish (removing space) reported as of January 1, 2011.
• Oglala Lakota County, South Dakota (46-102)
  Changed name and code from Shannon County (46-113) effective May 1, 2015.
• Shannon County, South Dakota (46-113)
  Changed name and code to Oglala Lakota County (46-102) effective May 1, 2015.

Substantial County or County Equivalent Boundary Changes

• Hoonah-Angoon Census Area, Alaska (02-105):
  Part taken to create new Petersburg Borough (02-195) effective January 3, 2013; estimated detached population: 1
• Prince of Wales-Hyder Census Area, Alaska (02-198):
  Prince of Wales-Hyder Census Area (02-198) added part of the former Petersburg Census Area (02-195) effective January 3, 2013; estimated added population 613.
• Bedford County, Virginia (51-019):
  Added the former independent city of Bedford (51-515) effective July 1, 2013; estimated net added population 6,222.

2000

Changes to Counties or County Equivalent Entities: 2000s

New Counties or County Equivalent Entities

• Hoonah-Angoon Census Area, Alaska (02-105):
  Created from the remainder of the former Skagway-Hoonah-Angoon Census Area (02-232) when the new Skagway Municipality (02-230) was created effective June 20, 2007; population: 2,574.
• Petersburg Census Area, Alaska (02-195):
  Created from the remainder of the former Wrangell-Petersburg Census Area (02-280) when the new Wrangell City and Borough was created effective June 1, 2008; estimated population: 4,260.
• Prince of Wales-Hyder Census Area, Alaska (02-198):
  Created from the remainder of the former Prince of Wales-Outer Ketchikan Census Area (02-201) after part (Outer Ketchikan area) was annexed by Ketchikan Gateway Borough (02-130) effective May 19, 2008, and part (Meyers Chuck area) included in the new Wrangell City and Borough effective June 1, 2008; estimated population: 6,115.
• Skagway Municipality, Alaska (02-230):
  Created from part of the former Skagway-Hoonah-Angoon Census Area (02-232) effective June 20, 2007; boundaries are identical to Skagway census subarea; population: 862. The remainder of the former Skagway-Hoonah-Angoon Census Area was established as the new Hoonah-Angoon Census Area (02-105).
• Wrangell City and Borough, Alaska (02-275):
  Created from part of the former Wrangell-Petersburg Census Area (02-280) and part of Prince of Wales-Outer Ketchikan Census Area (02-201) (Meyers Chuck area) effective June 1, 2008; estimated population: 2,448. The remainder of the former Wrangell-Petersburg Census Area was established as the new Petersburg Census Area (02-195) effective June 1, 2008.
• Broomfield County, Colorado (08-014):
  Created from parts of Adams (08-001), Boulder (08-013), Jefferson (08-059), and Weld (08-123) counties effective November 15, 2001. The boundaries of Broomfield County reflect the boundaries of Broomfield city legally in effect on that date; estimated population: 39,177.

Deleted Counties or County Equivalent Entities

• Prince of Wales-Outer Ketchikan Census Area, Alaska (02-201):
  Part (Outer Ketchikan area) annexed by Ketchikan Gateway Borough (02-130) and part (Meyers Chuck area) included in new Wrangell City and Borough (02-275), remainder renamed Prince of Wales-Hyder Census Area (02-198) effective May 19, 2008.
• Skagway-Hoonah-Angoon Census Area, Alaska (02-232):
  Split to create Skagway Municipality (02-230) and Hoonah-Angoon Census Area (02-105), effective June 20, 2007.
• Wrangell-Petersburg Census Area, Alaska (02-280):
  Split to create part of Wrangell City and Borough (02-275) and all of Petersburg Census Area (02-195), effective June 1, 2008.
• Clifton Forge (independent) city, Virginia (51-560):
  Changed to town status and added to Alleghany County (51-005) effective July 1, 2001.

Name and/or Code Changes or Corrections for Counties or County Equivalent Entities

• LaSalle County, Illinois (17-099);
  Name corrected from La Salle County (removing space).
• Doña Ana County, New Mexico (35-013):
  Name corrected from Dona Ana County (added tilde).

Substantial County or County Equivalent Boundary Changes

• Ketchikan Gateway Borough, Alaska (02-130):
  Annexed a substantial portion of the former Prince of Wales-Outer Ketchikan Census Area (02-201), including most of the area known as Outer Ketchikan effective May 19, 2008; estimated added population: 7. As a result, the remaining area of the former Prince of Wales-Outer Ketchikan Census Area was renamed Prince of Wales-Hyder Census Area (02-198).
• Adams County, Colorado (08-001):
  Part taken to create new Broomfield County (08-014) effective November 15, 2001; estimated detached population: 15,870.
• Boulder County, Colorado (08-013):
  Part taken to create new Broomfield County (08-014) effective November 15, 2001; estimated detached population: 21,512.
• Jefferson County, Colorado (08-059):
  Part taken to create new Broomfield County (08-014) effective November 15, 2001; estimated detached population: 1,726.
• Weld County, Colorado (08-123):
  Part taken to create new Broomfield County (08-014) effective November 15, 2001; estimated detached population: 69.
• Alleghany County, Virginia (51-005):
  Added the former independent city of Clifton Forge (51-560) effective July 1, 2001; estimated added population: 4,289.
• York County, Virginia (51-199):
  Exchanged territory with Newport News (independent) city (51-700) effective July 1, 2007; estimated net detached population: 293.
• Newport News (independent) city, Virginia (51-700):
  Exchanged territory with York County (51-199) effective July 1, 2007; estimated net added population: 293.

1990

Changes to Counties or County Equivalent Entities: 1990s

New Counties or County Equivalent Entities

• Denali Borough, Alaska (02-068):
  Created from part of the Yukon-Koyukuk Census Area (02-290) and an unpopulated part of the Southeast Fairbanks Census Area (02-240) effective December 7, 1990; 1990 population: 1,682.
• Skagway-Hoonah-Angoon Census Area, Alaska (02-232):
  Created from the remainder of the former Skagway-Yakutat-Angoon Census Area (02-231) when the new Yakutat City and Borough (02-282) was created effective September 22, 1992; 1990 population: 3,679.
• Yakutat City and Borough, Alaska (02-282):
  Created from part of the former Skagway-Yakutat-Angoon Census Area (02-231) effective September 22, 1992. The remainder of the former Skagway-Yakutat-Angoon Census Area was established as the new Skagway-Hoonah-Angoon Census Area (02-232) effective September 22, 1992; 1990 population: 725.

Deleted Counties or County Equivalent Entities

• Skagway-Yakutat-Angoon Census Area, Alaska (02-231):
  Split to create the Skagway-Hoonah-Angoon Census Area (02-232) and Yakutat City and Borough (02-282) effective September 22, 1992.
• Yellowstone National Park (county equivalent), Montana (30-113):
  Annexed to Gallatin (30-031) and Park (30-067) counties effective November 7, 1997.
• South Boston (independent) city, Virginia (51-780):
  Changed to town status and added to Halifax County (51-083) effective June 30, 1995.

Name and/or Code Changes or Corrections for Counties or County Equivalent Entities

• Dade County, Florida (12-025):
  Renamed as Miami-Dade County (12-086) effective July 22, 1997.
• Miami-Dade County, Florida (12-086):
  Renamed from Dade County (12-025) effective July 22, 1997.
• DeKalb County, Indiana (18-033):
  Name corrected from De Kalb County
• LaGrange County, Indiana (18-087):
  Name corrected from Lagrange County.
• LaPorte County, Indiana (18-091):
  Name corrected from La Porte County.
• De Baca County, New Mexico (35-011):
  Name corrected from DeBaca County (erroneously changed in the 1980s).
• McKean County, Pennsylvania (42-083):
  Name corrected from Mc Kean County.

Substantial County or County Equivalent Entity Boundary Changes

• Southeast Fairbanks Census Area, Alaska (02-240):
  Unpopulated part taken to create the new Denali Borough (02-068) effective December 7, 1990.
• Yukon-Koyukuk Census Area, Alaska (02-290):
  Part taken to create the new Denali Borough (02-068) effective December 7, 1990; 1990 detached population: 1,682.
• Franklin County, Florida (12-037):
  Boundary correction added unpopulated part of Gulf County (12-045); estimated area added: 10.4 square miles.
• Gulf County Florida (12-045):
  Boundary correction detached unpopulated part to Franklin County (12-037); estimated area detached: 10.4 square miles.
• Montgomery County, Maryland (24-031):
  Added territory (Takoma Park city) from Prince George?s County (24-033) effective July 1, 1997; 1990 added population: 5,156.
• Prince George's County, Maryland (24-033):
  Lost territory (Takoma Park city) to Montgomery County (24-031) effective July 1, 1997; 1990 detached population: 5,156.
• Gallatin County, Montana (30-031):
  Annexed unpopulated portion of deleted Yellowstone National Park (county equivalent) (30-113) effective November 7, 1997.
• Park County, Montana (30-067):
  Annexed portion of deleted Yellowstone National Park (county equivalent) (30-113) effective November 7, 1997; 1990 added population: 52.
• Carteret County, North Carolina (37-031):
  Boundary correction added from and detached unpopulated parts to Craven County (37-049); estimated area added: five square miles; estimated area detached: 16 square miles.
• Craven County, North Carolina (37-049):
  Boundary correction added from and detached unpopulated parts to Carteret County (37-031); estimated area added: 16 square miles; estimated area detached: five square miles.
• Augusta County, Virginia (51-015):
  Part annexed to Waynesboro (independent) city (51-820) effective July 1, 1994; no estimated population available.
• Bedford County, Virginia (51-019):
  Part annexed to Bedford (independent) city (51-515) effective July 1, 1993; estimated population: 200.
• Fairfax County, Virginia (51-059):
  Parts annexed to Fairfax (independent) city (51-600) effective December 31, 1991 and January 1, 1994; estimated population: 400.
• Halifax County, Virginia (51-083):
  Added the former independent city of South Boston (51-780) effective June 30, 1995.
• Prince William County, Virginia (51-153):
  Part annexed to Manassas Park (independent) city (51-685) effective December 31, 1990; no estimated population available.
• Southampton County, Virginia (51-175):
  Part annexed to Franklin (independent) city (51-620) effective December 31, 1995; estimated population: 400.
• Bedford (independent) city, Virginia (51-515):
  Annexed part of Bedford County (51-019) effective July 1, 1993; estimated population: 200.
• Fairfax (independent) city, Virginia (51-600):
  Annexed parts of Fairfax County (51-059) effective December 31, 1991 and January 1, 1994; estimated population: 400.
• Franklin (independent) city, Virginia (51-620):
  Annexed part of Southampton County (51-175) effective December 31, 1995; estimated population: 400.
• Manassas Park (independent) city, Virginia (51-685):
  Annexed part of Prince William County (51-153) effective December 31, 1990; no estimated population available.
• Waynesboro (independent) city, Virginia (51-820):
  Annexed part of Augusta County (51-015) effective July 1, 1994; no estimated population available.
• Arecibo Municipio, Puerto Rico (72-013):
  Lost territory to Florida Municipio (72-054) effective February 8, 1998; estimated population: 45.
• Barceloneta Municipio, Puerto Rico (72-017):
  Lost territory to Florida Municipio (72-054) effective February 8, 1998; estimated population: 1,860.
• Florida Municipio, Puerto Rico (72-054):
  Gained territory from Arecibo Municipio (72-013), Barceloneta Municipio (72-017), and Manatí Municipio (72-091) effective February 8, 1998; estimated population: 1,905.
• Manatí Municipio, Puerto Rico (72-091):
  Lost territory to Florida Municipio (72-054) effective February 8, 1998; estimated population: 0.
  

1980

Changes to Counties or County Equivalent Entities: 1980s

New Counties or County Equivalent Entities

• Aleutians East Borough, Alaska (02-013):
  Created from part of the former Aleutian Islands Census Area (02-010) effective October 23, 1987. The remainder of the former Aleutian Islands Census Area was established as the new Aleutians West Census Area (02-016); 1980 population: 1,643.
• Aleutians West Census Area, Alaska (02-016):
  Created from the remainder of the former Aleutian Islands Census Area (02-010) when the new Aleutians East Borough (02-013) was created effective October 23, 1987; 1980 population: 6,125.
• Lake and Peninsula Borough, Alaska (02-164):
  Created from part of the Dillingham Census Area (02-070) effective April 24, 1989; 1980 population: 1,384.
• Northwest Arctic Borough, Alaska (02-188):
  Created from all of the former Kobuk Census Area (02-140) and an unpopulated part of the North Slope Borough (02-185) effective June 2, 1986; 1980 population: 4,831.
• La Paz County, Arizona (04-012):
  Created from part of Yuma County (04-027) effective January 1, 1983; 1980 population: 12,557.
• Cibola County, New Mexico (35-006):
  Created from part of Valencia County (35-061) effective June 19, 1981; 1980 population: 30,347.

Deleted Counties or County Equivalent Entities

• Aleutian Islands Census Area, Alaska (02-010):
  Split to create the Aleutians East Borough (02-013) and the Aleutians West Census Area (02-016) effective October 23, 1987.
• Kobuk Census Area (02-140):
  All taken plus unpopulated part of the North Slope Borough (02-185) to create the new Northwest Arctic Borough (02-188) effective June 2, 1986.

Name and/or Code Changes or Corrections for Counties or County Equivalent Entities

• DeKalb County, Alabama (01-049):
  Name corrected from De Kalb County.
• DeSoto County, Florida (12-027):
  Name corrected from De Soto County.
• DeKalb County, Georgia (13-089):
  Name corrected from De Kalb County.
• DeKalb County, Illinois (17-037):
  Name corrected from De Kalb County.
• DuPage County, Illinois (17-043):
  Name corrected from Du Page County.
• DeSoto County, Mississippi (28-033):
  Name corrected from De Soto County.
• DeKalb County, Missouri (29-063):
  Name corrected from De Kalb County.
• LaMoure County, North Dakota (38-045):
  Name corrected from La Moure County.
• DeKalb County, Tennessee (47-041):
  Name corrected from De Kalb County.
• DeWitt County, Texas (48-123):
  Name corrected from De Witt County.

Substantial County or County Equivalent Entity Boundary Changes

• Dillingham Census Area (02-070):
  Part taken to create the new Lake and Peninsula Borough (02-164) effective April 24, 1989; 1980 detached population: 1,384.
• North Slope Borough (02-185):
  Unpopulated part plus all of the former Kobuk Census Area (02-140) taken to create the new Northwest Arctic Borough (02-188) effective June 2, 1986.
• Yuma County, Arizona (04-027):
  Part taken to create new La Paz County (04-012) effective January 1, 1983; 1980 detached population: 12,557.
• Adams County, Colorado (08-001):
  Annexed part of Denver County (08-031) coextensive with Denver city effective October 18, 1980; estimated population: 2,500. Part annexed to Denver County (08-031) effective May 17, 1988; estimated area 43.31 square miles with no estimated population.
• Denver County, Colorado (08-031) coextensive with Denver city:
  Part annexed to Adams County (08-001) effective October 18, 1980; estimated population: 2,500. Annexed part of Adams County (08-001) effective May 17, 1988; estimated area 43.31 square miles with no estimated population. Part annexed to Arapahoe County (08-005) effective July 28, 1980; estimated area one square mile with no estimated population.
• Arapahoe County, Colorado (08-005):
  Annexed part of Denver County (08-031) coextensive with Denver city effective July 28, 1980; estimated area one square mile with no estimated population.
• Valencia County, New Mexico (35-061):
  Part taken to create new Cibola County (35-006) effective June 19, 1981; 1980 detached population: 30,347.
• Albemarle County, Virginia (51-003):
  Part annexed to Charlottesville (independent) city (51-540) effective February 9, 1988; no estimated population available.
• Augusta County, Virginia (51-015):
  Part annexed to Staunton (independent) city (51-790) effective December 31, 1986; estimated population: 2,300. Part annexed to Waynesboro (independent) city (51-820) effective December 31, 1985; estimated population 3,000.
• Fairfax County, Virginia (51-059):
  Part annexed to Fairfax (independent) city (51-600) effective December 31, 1980; estimated population: 1,100.
• Greensville County, Virginia (51-081):
  Part annexed to Emporia (independent) city (51-595) effective January 1, 1988; estimated population: 400.
• James City County, Virginia (51-095):
  Part annexed to Williamsburg (independent) city (51-830) effective January 1, 1983; estimated population: 400.
• Pittsylvania County, Virginia (51-143):
  Part annexed to Danville (independent) city (51-590) effective December 31, 1987 and December 31, 1988; estimated population: 10,500.
• Prince William County, Virginia (51-153):
  Part annexed to Manassas (independent) city (51-683) effective December 31, 1983; estimated population: 300.
• Rockbridge County, Virginia (51-163):
  Part annexed to Buena Vista (independent) city (51-530) effective December 31, 1983; estimated population: 200.
• Rockingham County, Virginia (51-165):
  Part annexed to Harrisonburg (independent) city (51-660) effective December 31, 1982; estimated population: 5,500.
• Southampton County, Virginia (51-175):
  Part annexed to Franklin (independent) city (51-620) effective December 31, 1985; estimated population: 600.
• Spotsylvania County, Virginia (51-177):
  Part annexed to Fredericksburg (independent) city (51-630) effective December 31, 1983; estimated population: 2,800.
• Buena Vista (independent) city, Virginia (51-530):
  Annexed part of Rockbridge County (51-163) effective December 31, 1983; estimated population: 200.
• Charlottesville (independent) city, Virginia (51-540):
  Annexed part of Albemarle County (51-003) effective February 9, 1988; no estimated population available.
• Danville (independent) city, Virginia (51-590):
  Annexed part of Pittsylvania County (51-143) effective December 31, 1987 and December 31, 1988; estimated population: 10,500.
• Emporia (independent) city, Virginia (51-595):
  Annexed part of Greensville County (51-081) effective January 1, 1988; estimated population: 400.
• Fairfax (independent) city, Virginia (51-600):
  Annexed part of Fairfax County (51-059) effective December 31, 1980; estimated population: 1,100.
• Franklin (independent) city, Virginia (51-620):
  Annexed part of Southampton County (51-175) effective December 31, 1985; estimated population: 600.
• Fredericksburg (independent) city, Virginia (51-630):
  Annexed part of Spotsylvania County (51-177) effective December 31, 1983; estimated population: 2,800.
• Harrisonburg (independent) city, Virginia (51-660):
  Annexed part of Rockingham County (51-165) effective December 31, 1982; estimated population: 5,500.
• Manassas (independent) city, Virginia (51-683):
  Annexed part of Prince William County (51-153) effective December 31, 1983; estimated population: 300.
• Staunton (independent) city, Virginia (51-790):
  Annexed part of Augusta County (51-015) effective December 31, 1986; estimated population: 2,300.
• Waynesboro (independent) city, Virginia (51-820):
  Annexed part of Augusta County (51-015) effective December 31, 1985; estimated population: 3,000.
• Williamsburg (independent) city, Virginia (51-830):
  Annexed part of James City County (51-095) effective December 31, 1983; estimated population: 400.

1970

Changes to Counties or County Equivalent Entities: 1970s

Changes to County Equivalent Entities in Alaska

• The county equivalent entities in Alaska changed from Census Divisions in 1970 to Boroughs and Census Areas in 1980. The inventory and boundaries of the Alaska county-level entities changed substantially during the decade.
• New entities created in Alaska are: Dillingham Census Area (02-070), North Slope Borough (02-185), and Valdez-Cordova Census Area (02-261).

Deleted county equivalent entities in Alaska

• Angoon Division (02-030)
• Barrow Division (02-040)
• Cordova-McCarthy Division (02-080)
• Kenai-Cook Inlet Division (02-120)
• Kuskokwim Division (02-160)
• Outer Ketchikan Division (02-190)
• Prince of Wales Division (02-200)
• Skagway-Yakutat Division (02-230)
• Upper Yukon Division (02-250)
• Valdez-Chitina-Whittier Division (02-260)

New Counties or County Equivalent Entities

• Manassas (independent) city, Virginia (51-683):
  Changed from a town to a city and became independent of Prince William County (51-153) effective June 1, 1975; 1970 population: 9,164.
• Manassas Park (independent) city, Virginia (51-685):
  Changed from a town to a city and became independent of Prince William County (51-153) effective May 1, 1975; 1970 population: 6,844.
• Poquoson (independent) city, Virginia (51-735):
  Changed from a town to a city and became independent of York County (51-199) effective June 1, 1975; 1970 population: 5,441.

Deleted Counties or County Equivalent Entities

• Washabaugh County, South Dakota (46-131):
  Combined into Jackson County (46-071) effective January 1, 1979.
• Nansemond County, Virginia (51-123):
  Combined into Suffolk (independent) city (51-800) effective July 1, 1972.

Substantial County or County Equivalent Entity Boundary Changes

• Jackson County, South Dakota (46-071):
  Added all of the former Washabaugh County (46-131), effective January 1, 1979.
• Bedford County, Virginia (51-019):
  Part annexed to Lynchburg (independent) city (51-680), effective December 31, 1975; estimated population: 1,500.
• Campbell County, Virginia (51-031):
  Part annexed to Lynchburg (independent) city (51-680) effective December 31, 1975; estimated population: 9,000.
• Dinwiddie County, Virginia (51-053):
  Part annexed to Petersburg (independent) city (51-730) effective December 31, 1971; estimated population: 3,400.
• Frederick County, Virginia (51-069):
  Part annexed to Winchester (independent) city (51-840) effective December 31, 1970; estimated population: 4,800.
• Montgomery County, Virginia (51-121):
  Part annexed to Radford (independent) city (51-750) effective December 31, 1976; estimated population: 400.
• Prince George County, Virginia (51-149):
  Part annexed to Petersburg (independent) city (51-730) effective December 31, 1975; estimated population: 4,700.
• Prince William County, Virginia (51-153):
  Part taken when Manassas (51-683) and Manassas Park (51-685) became cities and separated from the county effective June 1, 1975, and May 1, 1975, respectively; 1970 population detached: 16,008.
• Roanoke County, Virginia (51-161):
  Part annexed to Roanoke (independent) city (51-770) effective December 31, 1975; estimated population: 13,500.
• Washington County, Virginia (51-191):
  Part annexed to Bristol (independent) city (51-520); estimated population: 4,800.
• York County, Virginia (51-199):
  Part taken when Poquoson (51-735) became a city and separated from the county effective June 1, 1975; 1970 population detached: 5,441.
• Bristol (independent) city, Virginia (51-520):
  Annexed part of Washington County (51-191); estimated population: 4,800.
• Lynchburg (independent) city, Virginia (51-680):
  Annexed part of Bedford County (51-019) effective December 31, 1975; estimated population: 1,500. Annexed part of Campbell County (51-031) effective December 31, 1975; estimated population: 9,000.
  
• Petersburg (independent) city, Virginia (51-730):
  Annexed part of Dinwiddie County (51-053) effective December 31, 1971; estimated population: 3,400. Annexed part of Prince George County (51-149) effective December 31, 1971; estimated population: 4,700.
  
• Radford (independent) city, Virginia (51-750):
  Annexed part of Montgomery County (51-121) effective December 31, 1976; estimated population: 400.
• Roanoke (independent) city, Virginia (51-770):
  Annexed part of Roanoke County (51-161) effective December 31, 1975; estimated population: 13,500.
• Suffolk (independent) city, Virginia (51-800):
  Added all of former Nansemond County (51-123) effective July 1, 1972.
• Winchester (independent) city, Virginia (51-840):
  Annexed part of Frederick County (51-069) effective December 31, 1970; estimated population: 4,800.