NULL Of 254 counties in the Lone Star State, Hardeman County ranks 223rd in terms of size (696 square miles). Hardeman County is in North Central Plains Texas. Recent listings of undeveloped land for sale in Texas's Hardeman County totals almost 1,000 acres and a combined market value of roughly $500,000. The most common type of land for sale by combined acreage in Hardeman County is residential property. Browse all Hardeman County undeveloped land for sale on the Land Network to find your next commercial property or land investment. The most common type of land for sale by combined acreage in Hardeman County is residential property.