Somerville, Texas. Somerville (/ˈsʌmərvɪl/ SUM-er-vill) is a city in Burleson County, Texas, United States. The population was 1,376 at the 2010 census. Somerville is 90 miles (140 km) north of Houston. Somerville is named for Albert Somerville the first president of the Gulf, Colorado and Santa Fe Railway.