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Maryland County Creation Dates and Parent Counties

Note
 See an interactive outline map of Maryland Historical Counties at Newberry Library site[1] (Free) Enter a year, Refresh Map, select zoom in, then click on the map to enlarge it.


Tip
 Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights.
Name of County Date Formed Boundary
Changes 		Parent County Counties Created by Boundary Changes
Allegany 1789 Dec 25 Details Washington Garrett 1872
Anne Arundel 1650 Apr 09 Details Colonial Lands Howard 1851, Harford 1773
Baltimore 1659 Jan 12 Details Colonial Lands Baltimore City 1851, Carroll 1837, Cecil 1674, Harford 1773, Howard 1851
Baltimore City 1851 Ma 1 Details Baltimore none
Calvert 1650 Jul 30 Details Charles (old) none
Caroline 1773 Jun 15 Details Dorchester, Queen Anne’s none
Carroll 1837 Jan 19 Details Baltimore, Frederick none
Cecil 1674 Jun 06 Details Baltimore none
Charles (old) Colonial Lands dissolved 28 Sep 1653
Charles 1658 Apr 13 Details Colonial Lands Calvert 1653, Prince George’s 1695
Dorchester 1668 May 27 Details Colonial Lands Caroline 1773
Frederick 1748 Jun 10 Details Prince George’s Carroll 1837, Montgomery 1776, Washington 1776
Garrett 1872 Nov 04 Details Allegany none
Harford 1773 Dec 17 Details Baltimore none
Howard 1851 May 13 Details Baltimore, Anne Arundel none
Kent 1637 Dec 30 Details Colonial Lands Talbot 1661
Montgomery 1776 Sep 06 Details Frederick none
Patuxent 1650 Oct 03 Details Colonial Lands renamed Worcester (old) 1669
Prince George’s 1695 Oct 03 Details Charles, Calvert Frederick 1748
Queen Anne’s 1706 Apr 09 Details Talbot Caroline 1773
Saint Mary’s 1637 Jan 24 Details Colonial Lands none
Somerset 1666 Aug 22 Details Colonial Lands Wicomico 1867,Worcster 1742
Talbot 1661 Feb 19 Details Kent Queen Anne’s 1706
Washington County, D.C. (?) 6 ( 17 Details Prince George’s, Montgomery District of Columbia
Washington 1776 Sep 06 Details Frederick none
Worcester (new) 1742 Oct 22 Details Somerset Wicomico 1867
Worcester (old) 1669 Oct 22 (OLD) Details Patuxent none

References

  1. ↑ [http://historical-county.newberry.org/website/Maryland/viewer.htm Maryland Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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