San Antonio Texas, is one of the fastest growing cities in the United States and is among the 10 top largest. San Antonio quick facts : San Antonio Population: 1,144,646 ( 2007 ) Bexar County Population: 1,392,931 ( 2007 ) San Antonio is the seat of Bexar County. The Metropolitan Statistical Area consists of Bexar, Comal, Guadalupe and Wilson Counties. San Antonio is in South Central Texas, approximately 140 miles northwest of the Gulf of Mexico and 150 miles northeast of the city of Laredo on the Mexican border. San Antonio Geography Square Miles of Land: 407.56 Latitude: 29.423N Longitude: -98.493W Elevation: 650 feet Miles to Austin: 79 Miles to Houston: 197 Miles to Dallas: 274 Miles to Laredo (Mexican border): 157 San Antonio Weather Average Temperature by Month (in degrees Fahrenheit) January: 49.3 February: 53.5 March: 61.7 April: 69.3 May: 75.5 June: 82.2 July: 85.0 August: 84.9 September: 79.3 October: 70.2 November: 60.4 December: 52.2