Owasso is located at 36°16'9" North, 95°51'15" West (36.269167, -95.854444).
According to the United States Census Bureau, the city has a total area of 10.05 mi2 (26.02 km2). 10.03 mi2 (25.98 km2) of it is land and 0.01 mi2 (0.04 km2) of it is covered by water. The total area is 0.14% water.
Owasso is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).