Darlington is a borough in Beaver County, Pennsylvania, United States.
According to the United States Census Bureau, the borough has a total area of 0.1 square miles, all of it land.
As of the census of 2000, there were 299 people, 122 households, and 79 families residing in the borough. The population density was 3,217.7 people per square mile. There were 130 housing units at an average density of 1,399.0 per square mile.
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