Land for sale in Pitkin County, Colorado, recently totaled $3 billion and almost 100,000 acres. Pitkin County ranks 17th out of 64 counties in the state for the total acreage of land currently advertised for sale. Of all locations in Pitkin County with land for sale, Aspen featured the most land for sale. Based on its natural assets, tourism and recreation are important contributors to the Pitkin County economy. Pitkin County is Colorado's 44th biggest county (973 square miles). It's located in the South Central Colorado region of Colorado.