Idaho, United States Genealogy

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Origin of Idaho
Idaho began as part of Oregon Territory. It became a separate territory in 1863, then encompassing most of what became Idaho, Montana, and Wyoming. Idaho was the 43rd state admitted to the Union, which occurred 3 July 1890.

Did you know

 * The Idaho State Archives (formerly the Idaho State History Society Public Archives and Research Library or PARL) is located at 2205 Old Penitentiary Road in Boise. They have a large collection of newspapers, photographs, and manuscripts relating to Idaho. The Research Center for the Archives is open Tuesday thru Saturday from 10 a.m. to 4 p.m. Their web site gives more information about their holdings.
 * You can find your villainous Idaho ancestors at Idaho Blacksheep Ancestors.
 * Gretna Greens. When an Idaho couple's marriage is not in their home county, search for it in alternate places like Coeur d'Alene, Kootenai, Idaho, or West Wendover, Elko, Nevada.

Research Tools

 * Find the county a town is in, or locate a physical feature, by using the United States Geographical Survey's Geographical Names Information System.
 * Idaho county creation dates and parent counties.
 * The Digital Atlas of Idaho has current maps and other interesting information about each of the counties of Idaho, although many towns are left off the maps.
 * Ask a question about how to find Idaho ancestors at the Western United States Research forum!
 * View historic Idaho maps in the David Rumsey Map Collection.
 * Find other Idaho genealogy websites at Cyndi's List - Idaho.
 * Research Guide: BYU Research Outline for Idaho

Idaho counties
Extinct or Renamed Counties :


 * Alturas -- 1864-1895.
 * Logan -- 1889-1895.

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