Saint Mary Parish is in Cajun Country Louisiana. Of the 64 counties in the state, 716,430-acre Saint Mary Parish ranks 11th by size. Louisiana's Saint Mary Parish has nearly 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of farmsand rural real estate for sale here was around $10 million. The average price of residential land for sale in Saint Mary Parish was $340,782. Browse all residential land and rural property for sale in Louisiana to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.