| Mahaska | Assessor | Persons Subject to Military Duty | 1864-1905 |
| Mahaska | Auditor | Real Estate Transfers-Lands-Record | 1864-1950 |
| Mahaska | Auditor | Real Estate Transfers-Town Lots-Record | 1861-1946 |
| Mahaska | Auditor | Swamp Land Record | 1862-1874 |
| Mahaska | Board of Commissioners | Board of Commissioners-Minute Books | 1844-1851 |
| Mahaska | Board of Supervisors | Board of Supervisor's Minute Books | 1864-1888 |
| Mahaska | Clerk | Circuit Court-Appearance Docket | 1874-1887 |
| Mahaska | Clerk | Circuit Court-Index & Record | 1868-1887 |
| Mahaska | Clerk | County Court-Record (including county business & marriage licenses) | 1851-1864 |
| Mahaska | Clerk | District Court-Appearance Docket | 1862-1874 |
| Mahaska | Clerk | District Court-Combined District Court Docket | 1887-1925 |
| Mahaska | Clerk | District Court-Journal | 1844-1854 |
| Mahaska | Clerk | District Court-Record | 1844-1926 |
| Mahaska | Clerk | District Court-Territory of Iowa-Court Minutes | 1844-1854 |
| Mahaska | Clerk | Naturalizations-Card Index | 1800s-1900s |
| Mahaska | Clerk | Naturalizations-Certificates | 1907-1925 |
| Mahaska | Clerk | Naturalizations-Declaration of Intent | 1906-1929 |
| Mahaska | Clerk | Naturalizations-Default | 1871-1880 |
| Mahaska | Clerk | Naturalizations-First Papers | 1869-1906 |
| Mahaska | Clerk | Naturalizations-Minors | 1889-1902 |
| Mahaska | Clerk | Naturalizations-Petition & Record | 1907-1929 |
| Mahaska | Clerk | Naturalizations-Record | 1881-1906 |
| Mahaska | Clerk | Probate Docket-Guardian | 1852-1891 |
| Mahaska | Clerk | Probate-Case Files-Index | 1858-1974 |
| Mahaska | Clerk | Probate-Combined Probate Docket-Administrator | 1881-1929 |
| Mahaska | Clerk | Probate-Combined Probate Docket-Guardian | 1852-1964 |
| Mahaska | Clerk | Probate-Complete Probate Record | 1866-1937 |
| Mahaska | Clerk | Probate-Complete Probate Record-Administrator | 1856-1881 |
| Mahaska | Clerk | Probate-General Index | 1851-1917 |
| Mahaska | Clerk | Probate-Inventories & Appraisements | 1881-1927 |
| Mahaska | Clerk | Probate-Judge's Book | 1853-1855 |
| Mahaska | Clerk | Probate-Letters-Administrator | 1876-1889 |
| Mahaska | Clerk | Probate-Record | 1844-1927 |
| Mahaska | Clerk | Probate-Record of Heirs & Estates | 1864-1867 |
| Mahaska | Clerk | Probate-Wills | 1851-1939 |
| Mahaska | Clerk | Vital Statistics-Divorces | 1906-1937 |
| Mahaska | Co Supt | Rural School Records | 1850-1865 |
| Mahaska | Private | Bible, Cemetery, Church, Family, Funeral Home Records | 1800s-1900s |
| Mahaska | Private | Sons of American Revolution Applications | 1885-1935 |
| Mahaska | Recorder | Deeds-Lands & Town Lots-Administration, Guardian | 1893-1901 |
| Mahaska | Recorder | Deeds-Lands-Record | 1865-1905 |
| Mahaska | Recorder | Deeds-Patent Records | 1899-1911 |
| Mahaska | Recorder | Deeds-Town Lots-Index | 1855-1901 |
| Mahaska | Recorder | Deeds-Town Lots-Record | 1867-1907 |
| Mahaska | Recorder | Deeds-Treasurer's Deeds | 1888-1913 |
| Mahaska | Recorder | Deeds/Mortgages-Lands-Index & Record | 1845-1865 |
| Mahaska | Recorder | Homestead Record | 1862-1953 |
| Mahaska | Recorder | Miscellaneous Record | 1875-1901 |
| Mahaska | Recorder | Miscellaneous Record-Index | 1875-1907 |
| Mahaska | Recorder | Mortgages-Lands-Index & Record | 1864-1888 |
| Mahaska | Recorder | Mortgages-Town Lots-Index & Record | 1864-1886 |
| Mahaska | Recorder | Original Entries, abstract | 1846-1858 |
| Mahaska | Recorder | Vital Statistics-Births-Record | 1880-1904; 1906-1931 |
| Mahaska | Recorder | Vital Statistics-Deaths-Record | 1880-1904; 1906-1929 |
| Mahaska | Recorder | Vital Statistics-Marriages-Record | 1851-1915 |
