The value of all land for sale in Porter County, Indiana, recently was around $135 million, representing a combined 1,660 acres of land for sale in Porter County. Porter County ranks seventh in the state for the total acreage of land currently advertised for sale. Valparaiso featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Porter County. Porter County is one of the ten largest counties in Indiana (521 square miles). It's located in the North Indiana region of Indiana.