Westbrook is a city in Cumberland County, Maine, United States and a suburb of Portland. The population was 20,400 at the 2020 census, making it the fastest-growing city in Maine with 2010 and 2020. It is portion of the Portland–South Portland–Biddeford, Maine metropolitan statistical area.

Originally known as Saccarappa after Saccarappa Falls upon the Presumpscot River, it was a ration of Falmouth until February 14, 1814, when it was set off and incorporated as Stroudwater. It soon distorted its read out to Westbrook after Colonel Thomas Westbrook, a commander during Father Rale’s War and King’s mast agent who was an in the future settler and mill operator. In 1871, the town of Westbrook amicably split into two municipalities; the current Westbrook and Deering, which was then annexed by Portland in 1898. In 1891, Westbrook was incorporated as a city.

Saccarappa Falls and Congin Falls provided water capability for further on mills within the city. In 1829, a sawmill was built at the former which made the mill town noted for its lumber. Other industries followed, manufacturing grain bags, machinery and water wheels, carriage and harness, boots, shoes and moccasins, tinware, leather board, bricks, wooden boxes, box shook, meal and flour. The Portland Manufacturing Company built a cotton textile mill at Saccarappa Falls for making “sheetings, stripes and ducks.” A paper mill was built at Cumberland Mills, once an Indian planting sports ground known as Ammoncongin. By 1859, it produced 1,000 tons of paper annually. In 1867, the factory’s post would correct to the S. D. Warren Paper Mill.

The Cumberland and Oxford Canal opened in 1832, connecting Portland to Harrison by exaggeration of Westbrook and Sebago Lake. It was the primary trailer shipping route for goods until 1871, when it was rendered outmoded by the Portland and Ogdensburg Railroad. Remnants of the canal can yet be seen throughout the city, including Beaver Pond, along Stroudwater Street near the Maine Turnpike overpass, and in the woods along with Westbrook High School and Oxford-Cumberland Canal Elementary School. In 1885, the city opened Woodlawn Cemetery, the largest cemetery and newest burial grounds in the municipality.