Boise County, Idaho Genealogy Records

Selected record inventories for Boise County, their listed years, and where to ask for access.

Selected inventory review: 2026-11-02. Selected repository catalog metadata reviewed. This is not a complete holdings audit or certification of current access. See the repository note for limitations. Official repository catalog or holdings guide

Formed
1863
County seat
Idaho City
Ada CountyAdams CountyBlaine CountyCamas CountyCanyon CountyCuster CountyElmore CountyGem CountyGooding CountyJerome CountyLemhi CountyLincoln CountyMinidoka CountyOwyhee CountyPayette CountyTwin Falls CountyValley CountyWashington CountyIdaho CountyBoise CountyAdaAdamsBlaineCamasCanyonCusterElmoreGoodingLincolnPayetteValleyWashingtonBoise
Boise CountyParent county (search here for earlier records)Today's boundaries · U.S. Census Bureau

Listed record inventories

Selected holdings and indexes for Boise County, checked against the repository descriptions linked below. Date spans may contain gaps; an index is not a complete set of original records.

Land records

Other records

See the repository's descriptions and search options

Repository access note: Selected Idaho State Archives county microfilm holdings, grouped by series description. Date envelopes combine listed film segments and may contain gaps. These are film holdings, not a claim of online images. Consult the linked inventory for roll, item, volume and exact dates. Historic Alturas County items were not reassigned to present-day counties.

Sources: the catalogs and repository descriptions linked on the entries above. Selected inventories do not establish complete coverage of every record type or online access to original documents. Read the repository access note for source dates and limitations.

Where to find the records

Offices change their hours and access rules; call before you visit.

Boundaries and parent counties

Formed from: Idaho County

Check the parent county for earlier records: Idaho County

Later formed partly from Boise County: Ada County, Custer County, Gem County, Oneida County, Owyhee County, Valley County, Washington County

ShoshoneMissoula (Mont.)Nez PerceNon-County Area 1IdahoNon-County Area 2BoiseBoiseNez PerceNon-County Area 2
Boise as created in 1863Today's boundaryBoundaries: Newberry Library, Atlas of Historical County Boundaries

Records stay with the county that created them. If your ancestor lived here before 1863, search the parent county. The Atlas of Historical County Boundaries shows each boundary change.

Research tip

Idaho began statewide registration of births and deaths in 1911. Before 1863 its land was part of Oregon and Washington territories (the east also of Nebraska and Dakota territories), and some early settlers in the southeast recorded events in Cache County, Utah, thinking they lived there.