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Delaware County Formation years
1673 1674 1678 1680 1681 1682 1685 1687 1704 1760 1775 1841      
Map Abbreviations
unorg. = unorganized
g. = gained
w. = with
fr. = from
atmt. = attachment
exch = exchanged
nca.= non county area
ch. = changed
Ke - Kent
NC - New Castle
Su - Sussex