Land for sale in Carroll County, Maryland, recently totaled $159 million and nearly 2,000 acres. Carroll County ranks fifth in the state based on the total acres of land for sale among all the counties in the Monumental State. Among cities in Carroll County with farms, hunting land and other rural land and acreage for sale, Westminster had the most land for sale. Carroll County is the 16th largest county (452 square miles) in Maryland. It's located in the Central Maryland region of Maryland.