NULL Of 254 counties in the Lone Star State, Karnes County ranks 212th in terms of size (753 square miles). Karnes County is in San Antonio Texas. Recent listings of lakefront land and property for sale in Karnes County, Texas, totals 1,000 acres and a combined market value of about $5 million. The most common type of land for sale by combined acreage in Karnes County is residential property. Browse all waterfront property for sale in Karnes County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Karnes County is residential property.