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County link goes to the Maryland Manual On-line, A Guide to Maryland Government
See also Maryland County Formation Map for additional help.

Allegany County (AL)

      Formed in 1789
      Erected from Washington County
      County seat: Cumberland
      Area in sq. mi. = 438 [ 1 ]

Anne Arundel County (AA)

      Formed in 1650
      Original County
      County seat: Annapolis
      Area in sq. mi. = 423 [ 1 ]
      History: Anne Arundel, for whom the Anne Arundel County is named, was the wife of the the second Lord Baltimore, Cecil Calvert. Cecil received the propriety charter of Maryland from King Charles I (whose wife was Henrietta Maria for whom Maryland is named) in 1632. Cecil had married Anne Arundell, daughter of Sir Thomas Arundell, first Baron Arundell of Wardour, four years earlier. She married Cecil Calvert when she was 13. Nine children resulted from the marriage, four of which lived into their adult life: Anne, Mary, Elizabeth, and Charles, who became 3rd Lord Baltimore. Anne died in 1649.

Baltimore County (BA)

      Formed in 1660
      Erected from Anne Arundel County
      County seat: Towson
      Area in sq. mi. = 598 [ 1 ] [ 2 ]

Baltimore City (BC)

      Formed in 1851
      Erected from Baltimore County
      Area in sq. mi. = 75 [ 1 ] [ 3 ]

Calvert County (CV)

      Formed in 1654
      Original County
      County seat: Prince Frederick
      Area in sq. mi. = 217 [ 1 ]

Caroline County (CA)

      Formed in 1773
      Erected from Dorchester and Queen Anne's counties
      County seat: Denton
      Area in sq. mi. = 321 [ 1 ]

Carroll County (CR)

      Formed in 1837
      Erected from Baltimore and Frederick counties
      County seat: Westminster
      Area in sq. mi. = 456 [ 1 ]

Cecil County (CE)

      Formed in 1674
      Erected from Baltimore and Kent counties
      County seat: Elkton
      Area in sq. mi. = 362 [ 1 ]

Charles County (CH)

      Formed in 1658
      Original County
      County seat: La Plata
      Area in sq. mi. = 459 [ 1 ]

Dorchester County (DO)

      Formed in 1669
      Erected from Somerset and Talbot counties
      County seat: Cambridge
      Area in sq. mi. = 594 [ 1 ]

Frederick County (FR)

      Formed in 1748
      Erected from Baltimore and Prince George's counties
      County seat: Frederick
      Area in sq. mi. = 665 [ 1 ]

Garrett County (GA)

      Formed in 1872
      Erected from Allegany County
      County seat: Oakland
      Area in sq. mi. = 659 [ 1 ]

Harford County (HA)

      Formed in 1773
      Erected from Baltimore County
      County seat: Bel Air
      Area in sq. mi. = 453 [ 1 ]

Howard County (HO)

      Formed in 1851
      Erected from Anne Arundel County
      County seat: Ellicott City
      Area in sq. mi. = 251 [ 1 ]

Kent County (KE)

      Formed in 1642
      Original County
      County seat: Chestertown
      Area in sq. mi. = 281 [ 1 ]

Montgomery County (MO)

      Formed in 1776
      Erected from Frederick County
      County seat: Rockville
      Area in sq. mi. = 496 [ 1 ]
      History: Montgomery County was named in honor of General Richard Montgomery, the first general to die fighting for American independence. General Montgomery died December 31, 1775. In September, 1776 Thomas Sprigg Wootton, delegate from Frederick County to the Maryland legislature introduced a bill "that after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit: Beginning at the east side of the mouth of Rock Creek, on the Potomac river, and running thence with the said river to the mouth of Monocacy, then with a straight line to Parr's Spring, from thence with the lines of the county to the beginning, shall be, in and hereby erected into a new county called Montgomery County."

Prince George's County (PG)

      Formed in 1695
      Erected from Calvert and Charles counties
      County seat: Upper Marlboro
      Area in sq. mi. = 484 [ 1 ]

Queen Anne's County (QA)

      Formed in 1706
      Erected from Dorchester, Kent, and Talbot counties
      County seat: Centreville
      Area in sq. mi. = 375 [ 1 ]

St. Mary's County (SM)

      Formed in 1637
      Original County
      County seat: Leonardtown
      Area in sq. mi. = 373 [ 1 ]

Somerset County (SO)

      Formed in 1666
      Original County
      County seat: Princess Anne
      Area in sq. mi. = 339 [ 1 ]

Talbot County (TA)

      Formed in 1662
      Original County
      County seat: Easton
      Area in sq. mi. = 261 [ 1 ]

Washington County (WA)

      Formed in 1776
      Erected from Frederick County
      County seat: Hagerstown
      Area in sq. mi. = 459 [ 1 ]

Wicomico County (WI)

      Formed in 1867
      Erected from Somerset and Worcester counties
      County seat: Salisbury
      Area in sq. mi. = 381 [ 1 ]

Worcester County (WO)

      Formed in 1742
      Erected from Somerset County
      County seat: Snow Hill
      Area in sq. mi. = 479 [ 1 ]


Source: Webster's New Geographical Dictionary, (Springfield, MA: G. & C. Merriam Co., 1972), p. 734.

[ 1 ] Area = land area. For additional information see: DNR's Fact Sheet No. 2

[ 2 ] Exclusive of the city of Baltimore which is administratively independent of the county.

[ 3 ] Administratively independent of Baltimore co. and has itself the status of a county

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