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Substantial Changes to Counties and County Equivalent Entities: 1970-Present

Substantial county boundary changes are those affecting an estimated population of 200 or more; changes of at least one square mile where an estimated population number was not available, but research indicated that 200 or more people may have been affected; and annexations of unpopulated territory of at least 10 square miles.

The Census Bureau’s reference date for geographic entity boundaries in all geographic and statistical data products is January 1 of the reference year (e.g., January 1, 2019).  Boundary changes with effective dates after January 1 will appear in geographic and statistical data products referenced to the following year. For example, a change with an effective date of January 2, 2019 will appear in products referenced to 2020.

Changes are listed below in the decade they occurred.

The Census Bureau does not produce before-and-after maps illustrating the boundary changes. Contact the state or county governments for more specific information about these changes.

1990
  • 2020
  • 2010
  • 2000
  • 1990
  • 1980
  • 1970
1990

Substantial Changes to Counties and County Equivalent Entities: 1970-Present

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.

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