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Baltimore County Chronology

1660, Jan 12 - [by 12 January 1659/1660] BALTIMORE was created from ANNE ARUNDEL, KENT, and Non-County Area 1 between ANNE ARUNDEL and KENT. BALTIMORE territorial limits, if any, are unknown and boundaries are estimated. (Archives of Md., 1:381)

1674, Jun 6 BALTIMORE lost to creation of CECIL. Boundary between BALTIMORE and ANNE ARUNDEL was redefined [no change]. (Archives of Md., 15:38-39)

1968, Apr 3 - BALTIMORE exchanged with ANNE ARUNDEL. (Archives of Md., 22:147)

1727, May 31 - BALTIMORE lost to ANNE ARUNDEL. (Archives of Md., 36:595)

1750, Jun 2 - BALTIMORE lost to FREDERICK. (Archives of Md., 46:468)

1774, Mar 2 - BALTIMORE lost to creation of HARFORD. (Archives of Md., 64:198)

1836, Jan 19 - BALTIMORE lost to creation of CARROLL. (Md. Laws 1835, ch. 256, sec. 1; Md. Laws 1836, ch. 19)

1851, Jul 4 - BALTIMORE lost to creation of the independent city of Baltimore City, which was separate from BALTIMORE County. (Md. Laws 1838, ch. 22, secs. 1, 4; Swindler, 4:413)

1888, Jun 1 - BALTIMORE lost to Baltimore City (Ind. City). (Md. Laws 1888, ch. 98, secs. 1-4/pp. 113-117)

1918, Mar 29 - BALTIMORE lost to Baltimore City (Ind. City). (Md. Laws 1918, ch. 82, sec. 1/p. 135)

Sources:

The Newberry Library, Atlas of Historical County Boundaries, Chicago, IL. Maryland, Baltimore County Chronology. View @ Newberry Library