Maryland County Creation Dates and Parent CountiesEdit This Page

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Name of County Date Formed Parent County Progeny County
Allegany 25 Dec 1789 Washington Garrett 1872
Ann Arundel 09 Apr 1650 Colonial Lands Howard 1851, Harford 1773
Baltimore 12 Jan 1659 Colonial Lands Baltimore City 1851, Carroll 1837, Cecil 1674, Harford 1773, Howard 1851
Baltimore City 13 May 1851 Baltimore none
Calvert 30 Jul 1650 Charles (old) none
Caroline 15 Jun 1773 Dorchester, Queen Anne’s none
Carroll 19 Jan 1837 Baltimore, Frederick none
Cecil 06 Jun 1674 Baltimore none
Charles (old 03 Oct 1650 Colonial Lands dissolved 28 Sep 1653
Charles 13 Apr 1658 Colonial Lands Calvert 1653, Prince George’s 1695
Dorchester 27 May 1668 Colonial Lands Caroline 1773
Frederick 10 Jun 1748 Prince George’s Carroll 1837, Montgomery 1776, Washington 1776
Garrett 04 Nov 1872 Allegany none
Harford 17 Dec 1773 Baltimore none
Howard (new) 13 May 1851 Baltimore, Anne Arundel none
Kent 30 Dec 1637 Colonial Lands Talbot 1661
Montgomery 06 Sep 1776 Frederick none
Patuxent 03 Oct 1650 Colonial Lands renamed Worcester (old) 1669
Prince George’s 03 Oct 1695 Charles, Calvert Frederick 1748
Queen Anne’s 09 Apr 1706 Talbot Caroline 1773
Saint Mary’s 24 Jan 1637 Colonial Lands none
Somerset 22 Aug 1666 Colonial Lands Wicomico 1867,Worcster 1742
Talbot 19 Feb 1661 Kent Queen Anne’s 1706
Washington County, D.C. 1776 (?) Prince George’s, Montgomery District of Columbia
Washington (new) 06 Sep 1776 Frederick none
Worcester (new) 22 Oct 1742 Somerset Wicomico 1867
Worcester (old) 22 Oct 1669 Patuxent none
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  • This page was last modified on 14 March 2009, at 07:11.
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