| 1851 | |
| 1852 | |
| 1853 | |
| 1854 | - Volusia County formed from Orange County* |
| 1855 | |
| 1856 | - Orlando named the county seat* |
| 1857 | - Orlando's name officially recognized by Post Office Department* - Alabama's Benjamin F. Caldwell deeds 4 acres of land to Orange County for site of county's first courthouse*** |
| 1858 | |
| 1859 | |
| 1860 | |
| 1861 | - Orlando Post Office discontinued March 19* |
| 1862 | |
| 1863 | - 2-story log courthouse built* Burned to the ground in 1868*** |
| 1864 | |
| 1865 | |
| 1866 | - Orlando Post Office re-established* |
| 1867 | |
| 1868 | - Civil Government re-established* - 1863 log courthouse burned. All court records destroyed except for Deed Book D which a clerk took home for the night*** |
| 1869 | - Second frame courthouse built* Served as church, schoolhouse and dance hall. Relocated in 1875 to make room for new courthouse. - Orange County official records begin* - Orange County schools established* |
| 1870 | - Sheriff Dave Mizell and up to 8 more killed as part of the Barber-Mizell Feud on February 21*** |
| 1871 | |
| 1872 | - Free Church and school house built* |
| 1873 | - Boundary lines between Orange and Brevard counties changed* - Jacob Summerlin moves to Orlando* |
| 1874 | |
| 1875 | - Orlando incorporated* - 1869 courthouse moved to make way for new 3-story courthouse and served as home of Orange County Reporter after the move*** - Large 3-story frame courthouse built* Used until 1892 when moved to corner of Main Street (Magnolia) and Church Street to become part of Tremont Hotel*** |
| 1876 | - Orange County Reporter founded* |
| 1877 | |
| 1878 | |
| 1879 | - Boundary line between Orange, Polk, and Sumter counties rearranged* |
| 1880 | - South Florida Railroad completed from Sanford to Orlando* |
References:
* Bacon, Eve. Orlando a Centennial History: Vol I. Chuluota, FL: The Mickler House, Publishers. 1975
** Bacon, Eve. Orlando a Centennial History: Vol II. Chuluota, FL: The Mickler House, Publishers. 1977
*** Orange County Regional History Center – Informational Display