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York County was created on August 19, 1749, from part of Lancaster County. It was named either for the Duke of York, an early patron of the Penn family, or for the city and shire of York in England. Its county seat is York. York County comprises the York-Hanover, PA Metropolitan Statistical Area.
- York County Heritage Trust Records searches available for a fee.
- "History of York County Pennsylvania" by George R Prowell; published in 1907 by J. H. Beers; 1,372 pages; free online book.