Brownsville is located at 25°54'3" North, 97°29'49" West (25.901111, -97.497222).
According to the United States Census Bureau, the city has a total area of 83.02 mi2 (215.02 km2). 80.40 mi2 (208.23 km2) of it is land and 2.62 mi2 (6.78 km2) of it is covered by water. The total area is 3.15% water.
Brownsville is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).