Addison is a borough in Somerset County, Pennsylvania, United States. It is part of the Johnstown, Pennsylvania, Metropolitan Statistical Area. The population was 165 at the 2020 census. Peter Augustine laid out the town of Petersburg, which later became Addison, in 1818. Henry Stuller built the first house here in 1820, the same year in which John Brown built a t…Addison is a borough in Somerset County, Pennsylvania, United States. It is part of the Johnstown, Pennsylvania, Metropolitan Statistical Area. The population was 165 at the 2020 census. Peter Augustine laid out the town of Petersburg, which later became Addison, in 1818. Henry Stuller built the first house here in 1820, the same year in which John Brown built a tavern. A schoolhouse was constructed about 1832, and a foundry was begun by Thomas & Nathan Cooper in 1844.
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