Comprising the booming Phoenix metropolitan area, Maricopa County is the fastest growing county in the country in terms of population growth. The combined value of land and rural real estate for sale in Arizona's Maricopa County recently on Land.com was approximately $6 billion. This represents nearly 100,000 acres of land for sale in Maricopa County. Maricopa County is among the top 10 counties in the United States with the most land currently for sale. Maricopa County ranks first in Arizona based on the total acres of land for sale among all the counties in the Grand Canyon State. Scottsdale featured the most land for sale. Maricopa County is one of the ten largest counties in Arizona (9,224 square miles). It's located in the Phoenix & Central Arizona region of Arizona.