Pettytown is an unincorporated community in Bastrop and Caldwell counties in the U.S. state of Texas.

Pettytown was started about 1850 by John and Elizabeth (Dawson) Petty, their 14 children, and their descendants.

It was shown on the 1940 county highway map and was then consolidated with the Red Rock district in 1949.

The portion in Caldwell County is served by the Lockhart Independent School District and the portion in Bastrop County is served by the Bastrop Independent School District.

By 1910, it was a school district, SD #37 Pettytown, which was used as a voting precinct, both registered in Bastrop County.