 The Dyer County portion of Trimble is part of the Dyersburg, TN Micropolitan Statistical Area, while the Obion County portion is part of the Union City, TN–KY Micropolitan Statistical Area.Trimble is located at (36.202228, -89.189013).According to the United States Census Bureau, the town has a total area of 0.6 square mile (1.7 km²), all land.