The purpose of the Brenham Heritage Museum is to preserve for public benefit and education the natural, historical, and artistic heritage of the region.

Built by the Federal government in 1915 to house the U.S. Post Office , the distinctive Classical Revival style building became the Brenham Heritage Museum in 1991 .  Exhibits illustrate the diverse history of Brenham in Washington county .  Special exhibits are presented throughout the year .  Adjacent to the museum is a display featuring Brenham's Silsby steam fire engine.  Purchased in 1879, it was one of the first steam engines in Brenham.