The Freeport Sulphur Company was instrumental in the founding and early development of Freeport and the surrounding region. Incorporated on July 12, 1912, it organized the Freeport Townsite Company to develop a city on the west bank of the Brazos River. The city was planned to be free of wharf and dock charges so goods and supplies could be imported efficiently, especially for the sulphur mines at Bryan Mound, and so sulphur could be exported quickly to national and international markets. In 1913, the Freeport National Bank built a one-story building with a built-in vault on land acquired from the Freeport Townsite Company. In 1918, the Freeport Sulphur Company bought adjoining property, erected a new two-story building, and added a second floor to the bank structure. The bank remained in business until 1955, when the Freeport Sulphur Company purchased the property and kept offices there until 1973. The Classical Revival building, with brick corbelling, a flat roof, multiple bays, and flat arched windows, reflects popular commercial building trends of the early 20th century.