Listed record inventories
Selected holdings and indexes for Ada 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
- Certificate of Naturalization1907–1926; gaps; see film list
- Declaration of Intention1906–1939; gaps; see film list
- Petition for Naturalization1907-1911
- Petition and Record1911–1927; gaps; see film list
- Petition for Citizenship1927–1935; gaps; see film list
- Petitions and Affidavits Relating to Naturalization1903-1906
- Record of Naturalization1903-1906
- Journal of the District Court, Admission to Citizenship1891-1903
- Record of Declaration of Intention1906–1929; gaps; see film list
- Declaration of Intent, Packet 9 (Ada Co.)1906-1909
- Declaration of Intent, Packet 10 (Ada Co.)1910-1911
- Certificate Stubs, Packet 11 (Ada Co.)1889-1909
- Naturalization, Packet 1 (Ada Co.)1907-1926
- Naturalization, Packet 21868-1869
- Naturalization, Packet 31883-1893
- Naturalization, Packet 4 (Ada Co.)1894-1910
- Naturalization, Packet 5 (Ada Co.)1908-1910
- Petition for Naturalization, Packet 6 (Ada Co.)1906-1910
- Declaration of Intent, Packet 7 (Ada Co.)1883-1903
- Declaration of Intent, Packet 8 (Ada Co.)1901-1906
Court records
- Judgement Book1865–1926; gaps; see film list
- Judgement Book, District Court1888–1916; gaps; see film list
- Judgement Book, District Court, Bk D1895-1896
- Judgement Book, (no cover image)1899-1905
- Judgement Book, Dist. Court1913-1914
- Judgements1914–1920; gaps; see film list
- Judgement Book, Dist Court1916
- Judgment Docket v. 11865-1899
- Judgment Docket1865–1931; gaps; see film list
- Index to Miscellaneous Records1890–1928; gaps; see film list
- Miscellaneous Record1891–1926; gaps; see film list
- Index to Powers of Attorney1891-1971
- Power of Attorney1865–1940; gaps; see film list
- Power of Attorney Record1891–1906; gaps; see film list
- Power of Attorney Revoked1909–1967; gaps; see film list
- Commissioner's Minute Books1865–1899; gaps; see film list
- Indexes to Judgement Books, B-M1871-1916
- Indexes to Judgement Books, N-K1916-1930
- Indexes to Judgement Books1929–1961; gaps; see film list
Tax records
- Tax Judgement Record1916-1919
- Assessment Roll v. 1 (cover image not legible)1865
- Assessment Roll of Ada County1866
- Subsequent Assessment Roll1866-1867
- Assessment Roll1868–1890; gaps; see film list
- Assessment Roll, Subsequent Assessment Roll1882
- Delinquent Assessment Roll1887
- Delinquent List1888–1890; gaps; see film list
- Delinquent Tax List (no cover)1878–1879; gaps; see film list
- Delinquent Tax List1880–1886; gaps; see film list
- Delinquent Tax List, for 1882 and 18851882-1885
Probate records
- Guardianship Record1894–1932; gaps; see film list
- Wills1869–1973; gaps; see film list
- Records… of Wills1871–1891; gaps; see film list
- Index to Wills, B.Cno dates
- Will Record. Book B1891-1899
- Record of Wills1899–1929; gaps; see film list
- Orders and Decrees1899-1903
- Probate Letters1899–1932; gaps; see film list
- Journal, Estates, Record of Appraisements1878-1886
- Re'crd, Estate & Ownership1868-1874
- Record, of Probate (cover image not clear) Book B1873-1877
- Record, of Probate? (cover image not clear) Book C1877-1879
- Record, (of Probate?) Book D1878–1883; gaps; see film list
- Probate Record1881–1927; gaps; see film list
- Duplicate Original Assessment Roll of Real Estate1866
Land records
- Deed Record1865–1925; gaps; see film list
- Deeds, Record-Ada Co1875-1878
- Record of Deeds1885–1889; gaps; see film list
- Deed Record from State of Idaho1892-1921
- Index of Deeds1864-1878
- Index to Deeds1876-1891
- Direct & Indirect Index Deed1890-1902
- Index to Separate Property of Married Women1869-1956
- Index to Pre-Emptions Homesteads Land Claims1865-1911
- Pre-Emptions Homesteads & Land Claims1865-1911
- Index, Pre-emptions Homesteads and Land Claimsno dates
- Index to Declaration of Homesteads1867-1904
- Declaration of Homesteads1867–1910; gaps; see film list
- Declaration of Homesteads and Abandonments1879-1898
- Homestead Abandonment1868-1909
- Index to US Patents1869-1954
- Land Patents1869-1885
- U.S. Patents1885-1912
- U.S. Patent Record1892-1905
- Records of Water Rights, AR-2021865–1943; gaps; see film list
- Water Rights Applications, Boise Project, AR-2021917-1921
- Indexes Volume 1 of Record of Water Rights1865-1887
- Indexes Volume 2 of Record of Water Rights1887-1901
- Indexes Volume 3 of Record of Water Rights1901-1943
- Ada County Deeds, Grantee index, A-G, H-O, P-Z1891-1924
- Ada County Deeds, Grantor index, A-G, H-O, P-Z1864-1924
Military records
Vital records
- Index to marriage recordno dates
- Index to Marriage Records1864-1928
- Index to Marriages Male1864-1927
- Index to Marriages Female1864-1927
- Marriage Record1865–1928; gaps; see film list
- Record of Marriage Certificates1887-1945
- Ministers Marriage Register1907–1943; gaps; see film list
- Birth Register1907-1910
- Death Register1907-1911
- Marriage Certificates1865–1894; gaps; see film list
- Marriage Licenses1895-1905
- Index to Marriages1864–1928; gaps; see film list
- Index to Marriages (A-K)1928-1956
- Index to Marriages (L-Z)1956-1974
- Index to Marriages (A-Z) & Licenses1974-1978
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
- Ada 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, Ada" 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: Boise County
Check the parent county for earlier records: Boise County
Later formed partly from Ada County: Canyon County, Washington County
Records stay with the county that created them. If your ancestor lived here before 1864, 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.