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Derry is a borough in Westmoreland County in the Commonwealth of Pennsylvania, east of Pittsburgh. The Borough of Derry, consisting of the town area, should not be confused with Derry Township, which is a separate municipality surrounding the borough. In 1900, the population numbered 2,347, and in 1910, 2,954. The population was 2,688 at the 2010 census. [edit] Research Tips
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