City of Old Mystic, Connecticut

Old Mystic is located at 41°23'27" North, 71°57'42" West (41.391111, -71.961944).

According to the United States Census Bureau, the city has a total area of 4.37 mi² (11.31 km²). 4.27 mi² (11.06 km²) of it is land and 0.10 mi² (0.25 km²) of it is covered by water. The total area is 2.24% water.

Old Mystic is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).