According to the United States Census Bureau, the town has a total area of 28.5 square miles (73.7 km²), of which, 18.2 square miles (47.1 km²) of it is land and 10.3 square miles (26.6 km²) of it (36.06%) is water.

Trenton Harbor Area Code is 207

• Trenton Chamber of Commerce: - 1007 Bar Harbor Rd. #102 - Trenton ME 04605
  Phone:207-667-1259
• Trenton Police Department: - 309 S. College Street,Trenton,TN 38382
  Phone:731-855-1413 Fax:731-855-0779