Port Lavaca is a city in Calhoun County, Texas, United States. The population was 12,035 at the 2000 census. It is the county seat of Calhoun County. It is a part of the Victoria, Texas, metropolitan statistical area. Port Lavaca apartments for rent comparison page shows most up to date rent information on Port Lavaca apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.