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| 1750 Jan. 27 - Cumberland County created - included Penn's Valley |
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| 1772 Mar. 21 - Northumberland County created - included Penn's Valley |
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| 1789 Sep. 19 - Mifflin County created - Penn's Valley stays in Northumberland Co. |
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1800 Feb. 13 - Centre County created - included Penn's Valley |
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| Here is the same map, zoomed out to see the county names |
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