As the 4th largest county in Texas and the 17th largest county nationally, Bexar County is steeped in rich history and tradition, while at the same time rapidly growing with a population approaching two million. Home of the first-ever digital library, BiblioTech, Bexar County is also the home of such treasures as the San Antonio Riverwalk, the Alamo, and our historic Missions, which are a World Heritage Site.