Listed record inventories
Selected holdings and indexes for Cassia County, checked against the repository descriptions linked below. Date spans may contain gaps; an index is not a complete set of original records.
Naturalization records
- Naturalization index1907-1914
- Record of Declaration of Intention1907–1929; gaps; see film list
- Acts of Naturalization1880-1906
- Petition and Record1907–1929; gaps; see film list
- Petition for Citizenship1930-1941
Court records
- Transcript Book (Executions on pp 43-44)1880
- Miscellaneous Index1915–1930; gaps; see film list
- Miscellaneous Record1879–1930; gaps; see film list
- Index to Register of Actions, A-Sno dates
- Index to Register of Actions, S-Zno dates
- Power of Attorney1919-1961
Land records
- Transcript Book (Warranty Deeds on pp 1-22)1877-1878
- Transcript Book (Water Rights Notices on pp 45-56)1875-1879
- Declarations of Homestead, Index1893-1915
- Homestead Declarations1893-1915
- Index to Deeds1878-1901
- Deeds1879–1899; gaps; see film list
- Deed Record1886–1902; gaps; see film list
Vital records
- Birth Register1907-1911
- Death Register1907-1911
- Transcript Book (Marriage Certificates on pp. 29-40)1874-1879
- Transcript Book (Marriage Applications on pp. 41-42)1876
- Marriage Record1887–1934; gaps; see film list
- Marriage Register1907-1925
- Marriage Affidavits1908–1934; gaps; see film list
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
- Cassia County official website
Hours, addresses and phone numbers for the county recorder and the district court, and any online record search the county offers.
- The county recorder
Deeds and other land records, and marriage licenses (the county clerk is also the recorder).
- The district court
Probate (wills and estates), divorces and civil and criminal cases.
- The Idaho State Archives
In Boise: county records, territorial records and the state's historical newspapers.
- Idaho State Archivesfree
The state archives in Boise, with county and territorial records, photographs and historical newspapers.
- FamilySearch Catalogfree
Search by place for "Idaho, Cassia" to find filmed and digitized records, many viewable free online with a FamilySearch account.
Offices change their hours and access rules; call before you visit.
Boundaries and parent counties
Formed from: Oneida County, Owyhee County
Check the parent counties for earlier records: Oneida County, Owyhee County
Later formed partly from Cassia County: Power County, Twin Falls County
Records stay with the county that created them. If your ancestor lived here before 1879, 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.