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Geography Main | Maps | TIGER | Gazetteer | Reference | ||||||
Note:
The Census Bureau does not have maps illustrating the boundary changes
listed on this Web page. Contact the state or county governments affected for more specific information about these changes.
This Web page contains significant county changes only. This includes all county boundary changes affecting at least an estimated population of 200 plus with additional changes of at least one square mile where no estimated population was provided and research indicated that the affected population may have been 200 people or more or "large" annexations of unpopulated territory (10 square miles of more.)
New Counties or County Equivalent Entities
Broomfield County, CO (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.
Clifton Forge (independent) city, Virginia (51-560):
Changed to town
status and added to Alleghany County (51-005) effective July 1, 2001.
Significant County or County Equivalent Boundary Changes
Adams County, Colorado (08-001):
Part taken to create new Broomfield
County (08-014) effective November 15, 2001.
Boulder County, Colorado (08-013):
Part taken to create new Broomfield
County (08-014) effective November 15, 2001.
Jefferson County, Colorado (08-059):
Part taken to create new Broomfield
County (08-014) effective November 15, 2001.
Weld County, Colorado (08-123):
Part taken to create new Broomfield County
(08-014) effective November 15, 2001.
Alleghany County, Virginia (51-005):
Added the former independent city of
Clifton Forge (51-560) effective July 1, 2001.
Note: Because these changes occurred after the Census 2000 boundary reference date (January 1, 2000) and after the 2001 population estimates reference date (January 1, 2001), these counties will be included in the Census Bureau's geographic products starting with the 2002 version of the TIGER/Line® files, slated for release late fourth quarter 2002.
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New Counties or County Equivalent Entities
Denali Borough, Alaska (02-068):
Created from part of the Yukon-Koyukuk Census
Area (02-290) and unpopulated part of the Southeast Fairbanks Census Area (02-240)
effective December 7, 1990.
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.
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.
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.
Renamed 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.
LaGrange County, Indiana (18-087):
Name corrected from Lagrange County.
LaPorte County, Indiana (18-091):
Name corrected from La Porte County.
McKean County, Pennsylvania (42-083):
Name corrected from Mc Kean County.
Significant 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.
Montgomery County, Maryland (24-031):
Added territory (Takoma Park city)
from Prince George’s County (24-033) effective July 1, 1997.
Prince George’s County, Maryland (24-033):
Lost territory (Takoma Park
city) to Montgomery County (24-031) effective July 1, 1997.
Gallatin County, Montana (30-031):
Annexed 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.
Arecibo Municipio, Puerto Rico (72-013):
Lost territory to Florida Municipio (72-054) effective February 8, 1998.
Barceloneta Municipio, Puerto Rico (72-017):
Lost territory to Florida Municipio (72-054) effective February 8, 1998.
Florida Municipio, Puerto Rico (72-054):
Gained territory from Arecibo Municipio (72-013), Barceloneta Municipio (72-017), and Manati Municipio (72-091) effective February 8, 1998.
Manati Municipio, Puerto Rico (72-091):
Lost territory to Florida Municipio (72-054) effective February 8, 1998.
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.
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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).
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.
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.
La Paz County, Arizona (04-012):
Created from part of Yuma County (04-027)
effective January 1, 1983.
Cibola County, New Mexico (35-006):
Created from part of Valencia County
(35-061) effective June 19, 1981.
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.
Significant 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.
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
effective January 1, 1983.
Valencia County, New Mexico (35-061):
Part taken to create new Cibola
County effective June 19, 1981.
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.
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.
Denver County, Colorado (08-001) 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.
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.
Rockbridge 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.
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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 significantly 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
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.
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.
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.
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.
Significant 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.
Prince William County, Virginia (51-153):
Part taken when Manassas (683) and Manassas Park (685) became cities and separated from the county.
Bedford County, Virginia (51-019):
Part annexed to Lynchburg (independent) city (51-520), effective date December 31, 1975; estimated population: 1,500.
Campbell County, Virginia (51-031):
Part annexed to Lynchburg
(independent) city (51-520) effective date December 31, 1975; estimated population: 9,000.
Dinwiddie County, Virginia (51-053):
Part annexed to Petersburg
(independent) city (51-730); estimated population: 3,400.
Frederick County, Virginia (51-069):
Part annexed to Winchester
(independent) city (51-840); estimated population: 400.
Montgomery County, Virginia (51-121):
Part annexed to Radford
(independent) city (51-750); estimated population: 4,800.
Prince George County, Virginia (51-149):
Part annexed to Petersburg
(independent) city (51-730) effective December 31, 1975; estimated population: 4,700.
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 (735) became a
city and separated from the county.
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 date 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); 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).
Winchester (independent) city, Virginia (51-840):
Annexed part of
Frederick County (51-069); estimated population: 4,800.
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Note: The Census Bureau does not have maps illustrating the boundary changes listed on this Web page. Contact the state or county governments affected for more specific information about these changes.
Source: U.S. Census Bureau, Geography Division
Created: May
24, 2002
Last revised: February 09 2005
