Brewer is a city in Penobscot County, Maine, United States. It is part of the Bangor, Maine Metropolitan Statistical Area. The city is named after its first settler, Colonel John Brewer. The population was 9,482 at the 2010 census.
Brewer is the sister city of Bangor. The two are on opposite sides of the Penobscot River and are connected by three bridges. Brewer and Bangor were originally both part of Condeskeag Plantation, though the Brewer part was also called "New Worcester" after John Brewer's birthplace. In 1788 Orrington, Maine was incorporated with Brewer/New Worcester as its major village. The other half of Condeskeag incorporated in 1791 as Bangor. Finally, in 1812 Brewer broke away from Orrington and incorporated as a separate town.
According to the United States Census Bureau, the city has a total area of 15.6 square miles (40.4 km²), of which, 15.1 square miles (39.1 km²) of it is land and 0.5 square miles (1.3 km²) of it is water. The total area is 3.21% fresh water.