From January 8, 1836 to December 13, 1837, the Municipality and County of Mina consisted of parts of present day Mason, Kimble, Llano, Burnet, Williamson, Gillespie, Blanco, Comal, Hays, Travis, Caldwell, Bastrop, Lee, Gonzales, Fayette, Washington, and Lavaca counties. On December 14, 1837, the Second Congress passed legislation changing the geographical limits, creating Fayette County, removing Gonzales and Caldwell Counties from the boundries and, five months later, added parts of Kimble and Comal Counties.
On December 18, 1837, Sam Houston signed an act incorporating the town of Mina and, on the same day, changing the name of the county and town of Mina to Bastrop. May 24, 1838 to January 24, 1840, shows the borders of Bastrop County to contain parts of present day Blanco, Burnet, Williamson, Travis, Hays, Comal, Caldwell, Bastrop, Lee, Gonzales and Fayette counties. From January 25, 1840 to January 25, 1850 the border changed to almost it's present size with a small portion of Lee, Williamson, Caldwell, Gonzales and Fayette counties included.
Original Colonies in the Bastrop County area:
- Austin 's Little Colony
- Milam Colony
- Leftwich's Colony
- Austin 's Original Colony
- DeWitt's Colony
