| Union County Auditor | |
| Animal Claims (Sheep Claims) | 1879-1917 |
| Auditor's Deed Records | 1864-1917 |
| Auditor's Ledger (Appropriation Ledger - Receipts and Disbursements) | 1854-1869 |
| Civil War Bounties | 1854-1869 |
| Civil Ward Commutation Records | 1854-1869 |
| Exempt Tax Lists | 1920-1990 |
| Land Sales | 1820-1917 |
| Officials' Oaths and Bonds | 1823-1933 |
| Personal Property Returns (Assessors' Returns) | 1893-1926 |
| Reappraisements (Appraisement Records) | 1825-1925 |
| Relief Orders - Civil War | 1861-1863 |
| Roster of Township Officers | 1886-1945 |
| Tax Lists - Cigarette | 1895-1948 |
| Tax Lists - Delinquent Personal (Chattel) | 1876-1901 |
| Tax Lists - Delinquent Real Estate | 1857-1864 |
| Tax Lists - Ditch | 1883-1900 |
| Tax Lists - Dogs | 1878-1878 |
| Tax Lists - Free Turnpike | 1867-1884 |
| Tax Lists - Gravel Road | 1872-1903 |
| Tax Lists - Liquor | 1883-1930 |
| Tax Lists - Personal (Chattel) | 1854-1900 |
| Tax Lists - Real Estate | 1820-1900 2012-2023 |
| Tax Lists - School | 1853-1861 |
| Union County Board of County Commissioners | |
| Commissioners' Journals | 1820-1838 1908-2023 |
| Commissioners' Journals - County Home | 1913-1987 |
| Ditch Records | 1908-1958 |
| Road Improvement Records | 1914-1917 |
| Union County Board of Education | |
| Board of Education Meeting Minutes | 1914-1992 |
| Union County Board of Elections | |
| Absentee Voter Register | 1944-1944 |
| Abstract of Votes | 1820-1959 |
| Board of Elections Minutes | 1915-2013 |
| Union County Board of Revision | |
| Minutes of the Board of Revision | 1925-1994 |
| Union County Board of School Examiners | |
| School Examiners Records | 1870-1935 |
| Union County Budget Commission | |
| Budget Commission Minutes | 1941-1995 |
| Union County Children's Services Board (Children's Home) | |
| Board of Trustees of the Children's Home Minutes | 1903-1973 |
| Children's Home Register | 1884-1951 |
| Visitors' Register | 1888-1922 |
| Union County Coroner | |
| Records of Inquests | 1883-1967 |
| Union County County Court | |
| Criminal Dockets | 1958-1963 |
| Index to Civil Dockets | 1958-1963 |
| Index to Criminal Dockets | 1958-1963 |
| Small Claims Dockets | 1958-1963 |
| Union County Engineer | |
| Road Records | 1820-1901 |
| Virginia Military Surveys (VMS) | 1798-1848 |
| Union County Home (Infirmary) | |
| County Home Registers | 1867-1974 |
| Visitors’ Registers | 1877-1935 |
| Union County Jury Commission | |
| Record of Proceedings and Jurors Selected | 1863-1990 |
| Union County Recorder | |
| Corporation Records (Articles of Incorporation) | 1851-1891 |
| Index to Deeds | 1875-1994 |
| Index to Miscellaneous Records | 1960-1994 |
| Index to Mortgages | 1944-1994 |
| Mechanics' Lien Records | 1856-1893 |
| Partnership and Traders Records | 1884-1885 |
| Plat Books | 1816-2020 |
| Record of War Veterans' Graves | 1820-2009 |
| Veterans' Burial Records | 1820-2011 |
| Union County Sheriff | |
| Foreign Execution Docket | 1838-1908 1964-2009 |
| Foreign Summons Docket (Foreign Writ Docket) | 1844-1904 |
| Jail Registers | 1874-1964 |
| Sheriff's Sales Journals | 1889-1912 |
| Union County Sinking Fund Trustees | |
| Minutes of the Trustees of the Sinking Fund | 1919-1936 |
| Union County Treasurer | |
| Records of Officials' Bonds | 1821-1971 |
| Tax Duplicates - Delinquent Personal (Chattel) | 1853-1887 |
| Tax Duplicates - Delinquent Real Estate | 1853-1882 |
| Tax Duplicates - Ditch | 1880-1880 |
| Tax Duplicates - Free Turnpike and Road | 1867-1873 |
| Tax Duplicates - Liquor | 1884-1930 |