IDGenWeb Project

a part of the USGenWeb Project

Idaho Census Maps

IDAHO CENSUS MAPS

This page shows the county boundaries at each US Census pertinent to present day Idaho, and at the formation of the Territory of Idaho. International visitors may want to see where Idaho is on this map of the United States of America

1850

  • Oregon Territory was established in 1848 and included all of present-day Idaho.

1860

  • The area north of 46o latitude was part of Spokane County, Washington.
  • Some people living in the Bear Lake area were enumerated as part of Cache County, Utah.

1863

  • Idaho Territory was organized in 1863.
  • For more information see Idaho Territorial Voters Poll Lists 1863,Transcribed, Edited and Indexed by Gene F. Williams, Boise, ID 1996.
  • Click here to see the map and key from Gene's book, used by permission.
    1. Shoshone
    2. Nez Perce
    3. Idaho
    4. Boise
    5. Missoula
    6. Other

1870

  • Parts of extreme southeast Oneida County were enumerated as part of Cache and Rich counties in Utah Territory.
  • Unorganized Kootenai County was enumerated with Nez Perce County.

1880

  • Yellowstone National Park was created in 1872 cutting a small slice out of the extreme northeast corner of Oneida County. Any persons enumerated within this area are found in the Wyoming census from that year forward.

1890

  • Idaho became a state in July 1890.
  • The federal census was lost for all counties.
  • Logan and Alturas counties were abolished in 1895.

1900

  • Bannock, Bingham and Nez Perce Indian schedules were microfilmed immediately following Washington County.
    1. Kootenai
    2. Latah
    3. Shoshone
    4. Nez Perce
    5. Idaho
    6. Lemhi
    7. Washington
    8. Boise
    9. Custer
    10. Fremont
    11. Canyon
    12. Ada
    13. Blaine
    14. Bingham
    15. Lincoln
    16. Owyhee
    17. Cassia
    18. Oneida
    19. Bannock
    20. Bear Lake
    21. Elmore

1910

  • An "every name" index exists for 1910, Idaho.
    1. Bonner
    2. Kootenai
    3. Shoshone
    4. Latah
    5. Nez Perce
    6. Idaho
    7. Washington
    8. Boise
    9. Custer
    10. Lemhi
    11. Canyon
    12. Ada
    13. Elmore
    14. Blaine
    15. Fremont
    16. Lincoln
    17. Bingham
    18. Owyhee
    19. Twin Falls
    20. Cassia
    21. Oneida
    22. Bannock
    23. Bear Lake

1920

  • Most of the modern county lines were set by 1920, but please note the unfinished boundaries of Ada, Elmore, Owyhee, Custer, Butte, Bannock, Caribou, Franklin, & Oneida counties.