Alameda County is a county in California. It covers 821 square miles (525,606 acres), which represents less than one percent of the state total. Of the 58 counties in California, Alameda County ranks seventh in terms of the size of its population (1.6 million, according to 2015 Census estimates). Recent Lands of America data places the average value of land for sale in Alameda County at $13,523 per acre. On average, the price of land for sale was $17,850 (the most expensive listing being for $20,000) and the median land-parcel size was one acre. Land for sale in Alameda County totaled three acres and $35,700 in overall land value. Farmland was the most common type of land for sale in Alameda County.