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Yarnell is an unincorporated community in Boggs Township, Centre County, Pennsylvania, United States. According to a 2020 census, the population was approximately 83(48 males, 35 females). The land area is 0.1700 km2 with a population density of 488.2/km2 as of 2020. There was a 12% increase in annual population change from 2010 to 2020.