Matagorda County is in Coastal Prairie Middle Texas. Of the 254 counties in the Lone Star State, Matagorda County ranks 16th in terms of size (1,612 square miles). Texas's Matagorda County has about 1,000 acres of beachfront homes and property for sale based on recent Land Network data. The combined market value of farms and ranches for sale here was almost $3 million. The average price of beachfront land for sale in Matagorda County was $782,250.