Philadelphia is a city in Loudon County, Tennessee, United States. Its population was 656 at the 2010 census. It is included in the Knoxvill…Philadelphia is a city in Loudon County, Tennessee, United States. Its population was 656 at the 2010 census. It is included in the Knoxville Metropolitan Statistical Area. Philadelphia was founded in the early 1820s by William Knox and Jacob Pearson. The town initially grew quickly and prospered as a center of business in the Sweetwater Valley. By the mid-19th century, Philadelphia had two general stores, a tanning yard, a stillhouse, and a hotel.
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