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 2010-2020.