Split, Merged, or Renamed Counties and County Equivalents
|State||Current County Name||Former County Name||Time Period|
|Alaska||Aleutians East Borough||Aleutian Islands1||1968–1993|
|Aleutians West Census Area||Aleutian Islands||1994–Present|
|Anchorage Borough||Anchorage District||1968–Present|
|Bethel Census Area||Bethel District & Kuskokwim District||1968–Present|
|Bristol Bay Borough2||Bristol Bay Division||1968–Present|
|Dillingham Census Area3||Bristol Bay Borough (in part)||1982–Present|
|Lake and Peninsula Borough||Dillingham Census Area (in part)||1994–Present|
|Fairbanks North Star Borough||Fairbanks District||1968–Present|
|Southeast Fairbanks Census Area||Southeast Fairbanks District||1982–Present|
|Juneau Borough||Juneau District||1968–Present|
|Kenai Peninsula Borough||Kenai-Cook Inlet District & Seward District||1968–Present|
|Ketchikan Gateway Borough||Ketchikan District||1968–Present|
|Kodiak Island Borough||Ketchikan District||1968–Present|
|Matanuska-Susitna Borough||Palmer-Wasilla District||1968–Present|
|Nome Census Area||Nome District||1968–Present|
|North Slope Borough||Barrow District||1968–Present|
|Northwest Arctic Borough||Kobuk Census Area4||1968–Present|
|Prince of Wales-Outer Ketchikan Census Area||Outer Ketchikan District & Prince of Wales District||1968–Present|
|Sitka Borough||Sitka District||1968–Present|
|Skagway-Hoonah-Angoon Census Area5||Skagway-Yakutat-Angoon Census Area6||1968–Present|
|Yakutat Census Area||Skagway-Yakutat-Angoon Census Area (in part)||1994–Present|
|Valdez-Cordova Census Area||Cordova-McCarthy District & Valdez-Chitina-Whittier District||1968–Present|
|Wade Hampton Census Area||Wade Hampton District||1968–Present|
|Wrangell-Petersburg Census Area||Wrangell District||1968–Present|
|Yukon-Koyukuk Census Area7||Upper Yukon District & Yukon-Koyukuk District||1968–Present|
|Denali Borough||Yukon-Koyukuk Census Area (in part)||1994–Present|
|Arizona||Yuma County8||Yuma County||1968–Present|
|La Paz County||Yuma County (in part)||1994–Present|
|Colorado||Adams, Boulder, Jefferson, and Weld Counties9||Adams, Boulder, Jefferson, and Weld Counties||1968–Present|
|Broomfield County||Adams, Boulder, Jefferson, and Weld Counties (in part)||2003–Present|
|Florida||Miami-Dade County||Dade County||1968–Present|
|Hawaii||Maui County10||Maui County||1968–Present|
|Kalawao County||Maui County (in part)||1982–Present|
|New Mexico||Valencia County11||Valencia County||1968–Present|
|Cibola County||Valencia County (in part)||1982–Present|
|New York||Bronx County||Bronx Borough||1968–Present|
|Kings County||Brooklyn Borough||1968–Present|
|New York County||Manhattan Borough||1968–Present|
|Queens County||Queens Borough||1968–Present|
|Richmond County||Staten Island Borough||1968–Present|
|South Dakota||Jackson County||Washabaugh County||1968–Present|
|Virginia||Alleghany County12||Alleghany County||1968–Present|
|Augusta County13||Augusta County||1968–Present|
|Waynesboro City||Augusta County (in part)||1970–Present|
|Chesapeake City14||Chesapeake City||1968–Present|
|Portsmouth City||Chesapeake City (in part)||1970–Present|
|Virginia Beach City||Chesapeake City (in part)||1970–Present|
|Frederick County15||Frederick County||1968–Present|
|Winchester City||Frederick County (in part)||1970–Present|
|Halifax County16||Halifax County||1968–Present|
|James City County17||James City County||1968–Present|
|Williamsburg City||James City County (in part)||1970–Present|
|Prince William County18||Prince William County||1968–Present|
|Manassas City||Prince William County (in part)||1982–Present|
|Manassas Park City||Prince William County (in part)||1982–Present|
|Suffolk City||Suffolk City||1968–Present|
|Suffolk City||Nansemond County||1968–1972|
|Suffolk City||Nansemond City||1973–1978|
|York County19||York County||1968–Present|
|Poquoson City||York County (in part)||1982–Present|
NOTE: The primary political divisions of most states are termed counties. Prior
to 1982, Alaskan county equivalents were called districts, divisions, or islands.
Since 1982, Alaskan county equivalents were reclassified as boroughs or census areas.
Virginia has many county-equivalent cities that are or were independent of any county
During the indicated time period, mortality data gathered from the National Center for Health Statistics (NCHS) multiple cause-of-death data files are assigned to specific counties within a state based on current county name. See U.S. Census Bureau for more information (http://www.census.gov/geo/reference/county-changes.html) about county names and the years the changes were made.
1 Mortality data from the "Aleutians Islands" were coded by NCHS from
1968–1993. We arbitrarily recoded these data to the Aleutians East Borough,
primarily for mapping purposes. Starting in 1994, NCHS began coding mortality data
for both the Aleutians East Borough and the Aleutians West Census Area.
2 Mortality data from the Bristol Bay Borough included mortality data from the Dillingham Census Area and the Lake and Peninsula Borough from 1968–1981.
3 Mortality data from the Dillingham Census Area included mortality data from the Lake and Peninsula Borough from 1982–1993.
4 Kobuk Census Area included the former Kobuk District and the former Kobuk Borough.
5 Mortality data from the Skagway-Hoonah-Angoon Census Area included mortality data from the Yakutat Census Area from
6 Skagway-Yakutat-Angoon Census Area included the former Skagway-Yakutat District.
7 Mortality data from the Yukon-Koyukuk Census Area included mortality data from the Denali Borough from 1968–1993.
8 Mortality data from Yuma County included mortality data from La Paz County from 1968–1993.
9 Mortality data from Adams, Boulder, Jefferson, and Weld Counties included mortality data from Broomfield County from
10 Mortality data from Maui County included mortality data from Kalawao County from 1968–1981.
11 Mortality data from Valencia County included mortality data from Cibola County from 1968–1981.
12 Mortality data from Alleghany County did not include mortality data from Clifton Forge City from 1968–1999.
13 Mortality data from Augusta County included mortality data from Waynesboro City from 1968–1969.
14 Mortality data from Chesapeake City included mortality data from Portsmouth City and Virginia Beach City from 1968–1969.
15 Mortality data from Frederick County included mortality data from Winchester City from 1968–1969.
16 Mortality data from Halifax County did not include mortality data from South Boston City from 1968–1995.
17 Mortality data from James City County included mortality data from Williamsburg City from 1968–1969.
18 Mortality data from Prince William County included mortality data from Manassas City and Manassas Park City from 1968–1981.
19 Mortality data from York County included mortality data from Poquoson City from 1968–1981.
- Content source: National Institute for Occupational Safety and Health (NIOSH)
- Page maintained by: Respiratory Health Division (RHD), Surveillance Branch