Thornburg is a borough in Allegheny County in the U.S. state of Pennsylvania. The population was 466 at the 2020 census. Thornburg is located at 40°26′01″N 80°04′59″W / 40.433568°N 80.083165°W. According to the United States Census Bureau, the borough has a total area of 0.4 square miles, all land.
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