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is a borough in Westmoreland County, Pennsylvania, United States, approximately 40 miles (64 km) east of Pittsburgh. Early in the 20th century, it had the largest sheet steel mill in the world. In July, 1915, the borough of Vandergrift Heights was consolidated with Vandergrift. In 1900, 2,076 people lived here; in 1910, 3,876. The population of Vandergrift Heights was 3,438 in 1910, therefore, the consolidation in 1915 almost doubled the population of Vandergrift. In 1940, 10,725 people lived in Vandergrift. The population was 5,455 at the 2000 census.
In the 1890s the Apollo Iron and Steel Company ended a bitterly contested labor dispute by hiring replacement workers from the surrounding countryside. To avoid future unrest, however, the company sought to gain tighter control over its workers not only at the factory but also in their homes. Drawing upon a philosophy of reform movements in Europe and the United States, the firm decided that providing workers with good housing and a good urban environment would make them more loyal and productive. In 1895, Apollo Iron and Steel built a new, integrated, non-unionized steelworks and hired the nation's preeminent landscape architectural firm, Olmsted, Olmsted and Eliot, to design the model industrial town: Vandergrift.