| Linn | Assessor | Persons Subject to Military Duty | 1861-1873 |
| Linn | Auditor | Real Estate Transfers-Lands-Record | 1868-1990 |
| Linn | Auditor | Real Estate Transfers-Town Lots-Record | 1866-1900 |
| Linn | Bd of Commissioners | Board of Commissioners Reports | 1839-1856 |
| Linn | City Council | Marion-City Council-Minutes | 1865-1965 |
| Linn | Clerk | County Court-Record | 1861-1869 |
| Linn | Clerk | District Court-Complete District Court Record | 1855-1860 |
| Linn | Clerk | District Court-Record | 1840-1845 |
| Linn | Clerk | Justice of the Peace-Dockets | 1874-1875 |
| Linn | Clerk | Name Change Record | 1904-1973 |
| Linn | Clerk | Naturalizations-Calendar | 1898-1903 |
| Linn | Clerk | Naturalizations-First & Second Papers | 1861-1868 |
| Linn | Clerk | Naturalizations-First Papers | 1873-1881 |
| Linn | Clerk | Naturalizations-Record | 1856-1906 |
| Linn | Clerk | Probate-Accounts | 1911-1921 |
| Linn | Clerk | Probate-Appearance Docket & Fee | 1893-1914 |
| Linn | Clerk | Probate-Bonds, Oaths & Letters-Adm, Exec, Gdn | 1873-1928 |
| Linn | Clerk | Probate-Case Files-Estates | 1846-1924 |
| Linn | Clerk | Probate-Case Files-Guardianships | 1846-1920 |
| Linn | Clerk | Probate-Combined Inheritane Tax & Lien Record | 1898-1925 |
| Linn | Clerk | Probate-Complete Probate Record | 1873-1928 |
| Linn | Clerk | Probate-Deed Record | 1881-1911 |
| Linn | Clerk | Probate-Fee Book | 1871-1901 |
| Linn | Clerk | Probate-General Index | 1840-1900 |
| Linn | Clerk | Probate-Inventories | 1899-1927 |
| Linn | Clerk | Probate-Letters | 1909-1920 |
| Linn | Clerk | Probate-Miscellaneous | 1900-1928 |
| Linn | Clerk | Probate-Record (incl Wills 1840-1875) | 1840-1885; 1895-1900 |
| Linn | Clerk | Probate-Record of Heirs & Estates | 1862-1883 |
| Linn | Clerk | Probate-Reports | 1900-1928 |
| Linn | Clerk | Probate-Wills | 1850-1929 |
| Linn | Clerk | Vital Stats-Divorces | 1910-1945 |
| Linn | Private | Church, Cemetery, School, Funeral Home, Historical, Atlas Records | 1800s-1900s |
| Linn | Recorder | Deeds-Cemetery Deeds | 1878-2003 |
| Linn | Recorder | Deeds-Lands-Index | 1841-1907 |
| Linn | Recorder | Deeds-Lands-Record | 1847-1886 |
| Linn | Recorder | Deeds-Town Lots-Index | 1852-1902 |
| Linn | Recorder | Deeds-Town Lots-Record | 1855-1900 |
| Linn | Recorder | Vital Stats-Births-Index | 1880-1904; 1906-1926 |
| Linn | Recorder | Vital Stats-Births-Record | 1880-1904; 1906-1926 |
| Linn | Recorder | Vital Stats-Deaths-Index | 1897-1904; 1906-1918 |
| Linn | Recorder | Vital Stats-Deaths-Record | 1880-1904; 1906-1919; 1923-1924 |
| Linn | Recorder | Vital Stats-Deaths-Record-Rapids Twp | 1911-1935 |
| Linn | Recorder | Vital Stats-Delayed Birth Record-Index | 1874-1940 |
| Linn | Recorder | Vital Stats-Marriages-Index | 1840-1933 |
| Linn | Recorder | Vital Stats-Marriages-Record | 1840-1920 |
| Linn | Treasurer | Old Age Pension Tax Lists | 1934-1936 |
