Erwinna is an unincorporated community located in Tinicum Township, Bucks County, Pennsylvania, with a zip code of 18920. The population of Erwinna is only 577.
It is pronounced exactly as it as spelled, "er-WIH-na", though it is sometimes mispronounced
"er-WEE-nuh".
Erwinna is located at (40.500115, -75.079019). The community has a total area of 4.23 square miles, all of it land.
There were 577 people, and 251 households residing in the community. The population density was 136.55 people per square mile. There were 251 housing units at an average density of 136.55/sq mi. There were 251 households out of which 68.1% were married couples living together. The median income for a household was $69,861. About 5.1% of the population were below the poverty line.
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