Postoak is an unincorporated community in Jack County, Texas, United States.

The area in what is known as Postoak today was established in 1878 and was named for a post oak tree that grew near its main street.

It also had a general store, a blacksmith shop, and a church that same year.

[2] Today, the community is served by the Midway Independent School District.

This article about a location in Jack County, Texas is a stub.