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- U. S. Gypsum Co.
- U. S. Post Office
- U.S. Strainrite
- UFO's
- Uncle Tom's Cabin Co.
- Underhill, Albert
- Union Americaine
- Union Band
- Union Block
- Union Canadienne
- Union Hall
- Union Mutual Life Insurance
- Union of Lewiston and Auburn
- Union Party
- Union Square
- Union St. Jean-Baptiste
- Union St. Joseph
- Union St. Joseph - Elections
- Union Street
- Union Trust Company
- Union Water Power - Millpond, Gate House, Water Pumping Station
- Union Water Power Co.
- United Baptist Church
- United Fuel Co.
- United Order of Pilgrim Fathers
- United Shoe Workers CIO
- United States Centennial celebration
- United States. Weather Bureau
- Unity Club
- Universalist Church
- Universalist Dramatic Club
- University of Maine Lewiston-Auburn
- Unsworth, John
- Upper Lisbon East Side --Signage and Cross-thru
- Upper Lisbon Street East
- Upper Lisbon Street West Side
- Uppermost Falls of the Pejepscot (see Harris Falls)
- Upton, T.
- Urban Development
- Urso, Camilla
- Ursuline Religious Sisterhood