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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