According to the United States Census Bureau, the town has a total area of 38.7 square miles (100.3 km²), of which, 36.8 square miles (95.4 km²) of it is land and 1.9 square miles (4.8 km²) of it (4.83%) is water. Winslow is located at the confluence of the Sebasticook River with the Kennebec River.

The town is crossed by U.S. Route 201 and State Routes 11, 32, 100 and 137. It borders the towns of Benton to the north, Albion to the east, China to the southeast, Vassalboro to the south, and (across the Kennebec River) Waterville to the west.

Winslow Area Code is 207

• Maine State Museum
• Lake Saint George State Park
• Winslow Memorial Park
• Fort Halifax State Historic Site

• Town of Winslow, ME - 114 Benton Avenue Winslow, Maine 04901
  Telephone: 207-872-2776
• Winslow Public Library - 136 Halifax Street, Winslow, Maine 04901
  Phone: 207-872-1978 Fax: 207-872-1979
• Brewer Police Department - 151 Parway South Brewer, ME 04412
  Telephone: 207-989-7001