Richfield is a census-designated place that is part of Monroe Township in Juniata County as well as a small portion located in West Perry Township, Snyder County in Pennsylvania, United States. The population was 549 at the 2010 census.Richfield is located at 40°41′18″N 77°6′43″W / 40.68833°N 77.11194°W / 40.68833; -77.11194.According to the United States Census Bureau, the CDP has a total area of 0.8 square miles, all of it land.As of the census of 2000, there were 459 people, 160 households, and 123 families residing in the CDP. The population density was 548.1 people per square mile. There were 177 housing units at an average density of 211.3/sq mi. The racial makeup of the CDP was 98.47% White, 0.22% from other races, and 1.31% from two or more races. Hispanic or Latino of any race were 0.65% of the population.There were 160 households, out of which 31.3% had children under the age of 18 living with them, 71.3% were married couples living together, 3.