Alexandria is located at 38°48'15" North, 77°2'49" West (38.804444, -77.047222).
According to the United States Census Bureau, the city has a total area of 15.41 mi2 (39.91 km2). 15.18 mi2 (39.31 km2) of it is land and 0.23 mi2 (0.60 km2) of it is covered by water. The total area is 1.49% water.
Alexandria is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).