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Work-Related Lung Disease Surveillance System (eWoRLD)

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 organization.
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/www/tiger/ctychng.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
1968–1993.
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
1968–2002.
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.

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