West Columbia is a city in Brazoria County in the U.S. state of Texas. The city is centered on the intersection of Texas Highways 35 & 36, 55 miles (89 km) southwest of downtown Houston. The population was 3,905 at the 2010 census.The 1st Congress of the Republic of Texas was convened in West Columbia on October 3, 1836. (It was then named simply Columbia.)According to the United States Census Bureau, West Columbia has a total area of 2.6 square miles (6.7 km2), of which 0.02 square miles (0.04 km2), or 0.67%, is water.