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Harrison County was established from Monongalia County in 1784.
1787 - Randolph established from Harrison .
1798 - Wood established from Harrison.
1816 - Lewis established from Harrison.
1842 - Marion established from Harrison and Monongalia.
1843 - Barbour established from Harrison, Lewis and Randolph. Ritchie established Harrison, Lewis and Wood.
1844 - Taylor established from Harrison, Lewis, Marion and Preston.
1845 - Doddridge established from Harrison, Lewis, Ritchie and Tyler.