Maryland County Creation Dates and Parent Counties
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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. |
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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[edit | edit source]
- ↑ [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.
