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.