The Commercial Bank was founded by Mrs. Anna Martin and her sons, Charles and Max, in 1901, and was originally located in Hedwigs Hill, ten miles south of Mason near the Llano River. Martin is the first woman to found a bank in the United States that is still in existence. She was also a rancher and is the only woman listed on the monument to Mason County ranchers and trail drivers on the east side of the courthouse lawn. The Commercial Bank occupied several sites around the Square over the years. Its current site was occupied by a saloon in the late 1800s, followed by a Piggly Wiggly Grocery and other businesses during modern times.

The current bank building was constructed in 1965, and in 1976, the bank purchased the Larrimore building on the south side, expanding its facility into that building. The Commercial Bank's board room houses the personal collection of wood sculptures and bronzes of Gene Zesch, Mason County's world-famous artist. The collection is open for public viewing during banking hours. If you want to know the time, temperature, and weather in Mason call (325) 347-8212. If you need a cup of coffee or a soft drink, stop by during banking hours.