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The Biddeford–Saco Mills Historic District encompasses the historic mill complex that flanks both sides of the Saco River in Biddeford and Saco, Maine. It covers 38 acres (15 ha) of property adjacent to both cities' downtown areas which has seen industrial uses since the 18th century, and presently contains a collection of well-preserved 19th and early-20th century industrial buildings.

Biddeford City Theater is a restored Victorian opera house at 205 Main Street in Biddeford, Maine, United States. City Theater produces and hosts theater, dance and music performances year-round and aims to, “foster an appreciation for the performing arts by using creative avenues to increase community involvement.”City Theater is part of the Biddeford City Hall complex, designed by Maine architect John Calvin Stevens in 1895.

The A. B. Seavey House is a historic house at 90 Temple Street in Saco, Maine. Built in 1890, it is one of the city's finest examples of Queen Anne architecture. It was listed on the National Register of Historic Places in 1978.

Biddeford Main Street Historic District is an historic district in downtown Biddeford, Maine. It encompasses the heart of the city's civic and commercial business district, extending along Main and Water Streets between Pike and Elm Streets, extending for short distances along several side streets. It is noted for its collection of late 19th and early 20th century commercial brick and masonry architecture.

The J.G. Deering House also known as the Dyer Library/Saco Museum is an historic house at 371 Main Street in Saco, Maine. Completed in 1870, it is a fine local example of Italianate style. Built for Joseph Godfrey Deering, it was given by his heirs to the city for use as a library. It was listed on the National Register of Historic Places in 1982.

Saint Joseph's Church is the head church of the Good Shepherd Parish located at 178 Elm Street in Biddeford, Maine.

The Jacobs Houses and Store are a collection of three Federal-period historic buildings at 9-17 Elm Street in Saco, Maine. Built between 1820 and 1826, there are two similar wood-frame houses and a large brick commercial building, all associated with the Jacobs family, local businessmen. The buildings were listed as a group on the National Register of Historic Places in 1982.

Dyer Library is the public library serving Saco, Maine.Funded by a bequest from Olive Dyer, the first home of the Dyer Library opened in 1881 in the basement of Saco City Hall. The library is now located in the J.G. Deering House.

The Dudley Block is a historic mixed-use commercial and residential building in at 28-34 Water Street in downtown Biddeford, Maine. Built in 1848, it is one of the older buildings in the downtown area, and is a fine example of Greek Revival commercial architecture. It was listed on the National Register of Historic Places in 1982, and was included in the Biddeford Main Street Historic District in 2009.

Saco City Hall is located at 300 Main Street in downtown Saco, Maine. It is a transitional Greek Revival-Italianate brick building, designed by Thomas Hill and built in 1855. It was listed on the National Register of Historic Places in 1979.