NationMaster - Encyclopedia: List of Maryland counties

Allegany County: formed in 1789 from part of Washington County. County seat: Cumberland.
Anne Arundel County: formed in 1650 from unorganized territory. County seat: Annapolis. Was named Providence County between 1654 and 1658.
Baltimore City: founded in 1729. Detached* in 1851 from Baltimore County.
Baltimore County: formed in 1659 from unorganized territory. County seat: Towson.
Calvert County: formed in 1654 as Patuxent County from unorganized territory. Renamed Calvert County in 1658. County seat: Prince Frederick.
Caroline County: formed in 1789 from parts of Dorchester County and Queen Anne's County. County seat: Denton.
Carroll County: formed in 1837 from parts of Baltimore County and Frederick County. County seat: Westminster.
Cecil County: formed in 1672 from parts of Baltimore County and Kent County. County seat: Elkton.
Charles County: formed in 1658 from unorganized territory. County seat: La Plata.
Dorchester County: formed in 1668 from unorganized territory. County seat: Cambridge.
Frederick County: formed in 1748 from part of Prince George's County. County seat: Frederick.
Garrett County: formed in 1872 from part of Allegany County. County seat: Oakland.
Harford County: formed in 1773 from part of Baltimore County. County seat: Bel Air.
Howard County: formed in 1851 from parts of Anne Arundel County and Baltimore County. County seat: Ellicott City.
Kent County: formed in 1642 from unorganized territory. County seat: Chestertown.
Montgomery County: formed in 1776 from part of Frederick County. County seat: Rockville.
Prince George's County: formed in 1695 from parts of Calvert County and Charles County. County seat: Upper Marlboro.
Queen Anne's County: formed in 1706 from part of Talbot County. County seat: Centerville.
St. Mary's County: formed in 1637 from unorganized territory. County seat: Leonardtown. Was named Potomac County between 1654 aqnd 1658.
Somerset County: formed in 1666 from unorganized territory. County seat: Princess Anne.
Talbot County: formed in 1662 from part of Kent County. County seat: Easton.
Washington County: formed in 1776 from part of Frederick County. County seat: Hagerstown.
Wicomico County: formed in 1867 from parts of Somerset County and Worcester County. County seat: Salisbury.
Worcester County: formed in 1742 from part of Somerset County. County seat: Snow Hill.

*Though an independent city rather than a county, the City of Baltimore is considered the equal of a county for most purposes.

Defunct counties:

Charles County: formed in 1650 from part of Saint Mary's County. Abolished in 1654.
Durham County: formed in 1669 from part of Somerset County and nonorganized territory. Abolished in 1672 and incorporated in Worcester County.
Worcester County: formed in 1672 from part of Durham County and nonorganized territory. Lost in 1685 when Delaware Colony was established.

Sources

Maryland Formation Maps (http://www.negenealogy.com/md/md_maps/md_cf.htm)
map Maryland QuickFacts from the US Census Bureau (http://quickfacts.census.gov/qfd/maps/maryland_map.html)

Regions of Maryland
Western \| Southern \| Eastern Shore \| Baltimore-Washington Metro Area \| Chesapeake \| Delaware Valley
Largest Cities
Annapolis \| Baltimore \| Bowie \| College Park \| Cumberland \| Frederick \| Gaithersburg \| Greenbelt \| Hagerstown \| Laurel \| Rockville \| Salisbury \| Takoma Park \| Westminster
Counties
Allegany \| Anne Arundel \| Baltimore City \| Baltimore County \| Calvert \| Caroline \| Carroll \| Cecil \| Charles \| Dorchester \| Frederick \| Garrett \| Harford \| Howard \| Kent \| Montgomery \| Prince George's \| Queen Anne's \| St. Mary's \| Somerset \| Talbot \| Washington \| Wicomico \| Worcester

Categories: Lists of U.S. counties | Maryland counties

Results from FactBites:

BIGpedia - Maryland - Encyclopedia and Dictionary Online (2136 words)
	Maryland is a republic; the United States guarantees her "republican form of government" [USC Article IV, section 4] although there is considerable disagreement about the meaning of that phrase.
	Maryland is bounded on the north by Pennsylvania, on the west by West Virginia, on the east by Delaware and the Atlantic Ocean, and on the south, across the Potomac River, by Virginia.
	A portion of extreme western Maryland in Garrett County is drained by the Youghiogheny River as part of the watershed of the Mississippi River.

More results at FactBites »

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