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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.

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

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

Changes to Counties or County Equivalent Entities: 2010s

New Counties or County Equivalent Entities

  • Chugach Census Area, Alaska (02-063):
    Created from part of former Valdez-Cordova Census Area (02-261) effective January 02, 2019.
  • Copper River Census Area, Alaska (02-066):
    Created from part of former Valdez-Cordova Census Area (02-261) effective January 02, 2019.
  • 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

  • Valdez-Cordova Census Area, Alaska (02-261):
    Split to form Chugach Census Area (02-063) and Copper River Census Area (02-066) effective January 02, 2019.
  • 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.

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