Mezősas is located 50 kilometers away from the city of Debrecen, and is located within Hajdú-Bihar county. Like most major villages in Hungary, Mezősas is accessible by road. The village has a population estimate of 595 as of the first of January, 2011. The last actual head count was in 2015, when the population totaled 665,[1] down from the 779 people residing there in 1990.