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, also known as "The Rocks", is a borough in Allegheny County, Pennsylvania, along the south bank of the Ohio River, adjoining Pittsburgh. In the past, it was known for its extensive iron and steel interests. Also, there were large railroad machine shops, and manufacturers of enamel ware, lumber, wall materials, plaster, locomotive and springs, nuts and bolts, malleable castings, chains and forgings, freight and passenger cars, tin ware, and concrete, cigars.
The Pittsburgh, Allegheny and McKees Rocks Railroad is located in an area known as the 'Bottoms.'
The name of the borough is often incorrectly stated as "Mc Kees Rocks," "McKee's Rocks," or "McKees Rock," but the official name is "McKees Rocks." It is within the Sto-Rox School District, which serves McKees Rocks and neighboring Stowe Township. The local high school is Sto-Rox High School.
The McKees Rocks Bridge, which carries traffic between McKees Rocks and Pittsburgh, is the longest bridge in Allegheny County, Pennsylvania at .
The area is well-served by Port Authority bus routes 21A, 21B, 21C, 21D, 21F, CO, and 24A.
McKees Rocks is one of the oldest sites of human habitation in eastern North America. Skeletons have been discovered that are thousands of years old, dating from a time before ancient Greece and Rome. It was considered by George Washington as a possible location for Fort Pitt, which was eventually built on the site of the destroyed French Fort Duquesne in what is now Pittsburgh's Point State Park. In 1900, 6,353 people resided here; in 1910, 14,702; in 1920, 16,713, and in 1940, 17,021 people inhabited McKees Rocks. The population was 6,622 at the 2000 census.
The borough derives its name from Alexander McKee, to whom a 1,300 acre (5.3 km²) tract of land was given in 1764, and from a rocky projection into the river at this site.
The Mann's Hotel, which is the second oldest building in the Pittsburgh area, is in McKees Rocks, dating from the 1700s (despite the incorrect year of 1803 being painted on the facade).