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is a city in Cambria County, Pennsylvania, United States, miles east of Pittsburgh and west-southwest of Altoona, Pennsylvania. The population was 23,906 at the 2000 census. It is the principal city of the Johnstown, Pennsylvania, Metropolitan Statistical Area, which includes Cambria County. As of 2007, the Metropolitan Statistical Area had a population of 144,995.
Johnstown, settled in 1770, is perhaps most famous for its three floods. The "Great Flood" of May 31, 1889 occurred after the South Fork Dam collapsed 14 miles (23 km) upstream from the city during heavy rains. At least 2,209 people died as a result of the flood and subsequent fire that raged through the debris. Other major floods occurred in 1936 and 1977.