what county is zip code 77511
Zip Code 77511 Population. 77511 is located in the state of Texas in the Houston metro area. Zip code 77511 is primarily located in Brazoria County. Portions of 77511 are also located in Galveston County. The official postal service name used for 77511 is ALVIN, Texas.ip Code 77511 Core Based Statistical Area. 77511 is located in the state of Texas in the Houston metro area. Zip code 77511 is primarily located in Brazoria County. Portions of 77511 are also located in Galveston County.