The value of all land for sale in Garrett County recently was almost $112 million, representing a combined 1,104 acres of land for sale in Garrett County. Garrett County ranks third out of 24 counties in the state for the combined amount of land currently advertised for sale. Of all land for sale in Garrett County, Mchenry featured the most land for sale. Based on its natural assets, Garrett County's economy is dependent on tourism and recreation. Garrett County is one of the ten largest counties in Maryland (657 square miles). It's located in the Western Maryland region of the state.