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April 10, 1947 -
MIDDLESEX exchanged small areas with ESSEX when town of Lynnfield exchanged with Reading.
(Mass. Acts 1947, ch. 243, sec. 1/p. 222)
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January 05, 1874 -
April 10, 1947
MIDDLESEX lost to SUFFOLK when Boston gained all of Brighton and Charlestown.
(Mass. Acts 1873, ch. 286, sec. 1/p. 716, ch. 303, sec. 1/p. 747, and ch. 314, sec. 1/p. 810)
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March 20, 1868 -
January 05, 1874
MIDDLESEX gained from WORCESTER when town of Hudson gained from Bolton.
(Mass. Acts 1868, ch. 79, sec. 1/p. 62)
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April 01, 1859 -
March 20, 1868
MIDDLESEX lost small area to WORCESTER when town of Milford gained from Holliston.
(Mass. Acts 1859, ch. 149/p. 312)
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January 07, 1858 -
April 01, 1859
MIDDLESEX gained from ESSEX when town of North Reading gained from Lynnfield.
(Mass. Acts 1857, ch. 238, sec. 1/p. 572; Mass. Sec. Comm., 41)
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April 10, 1854 -
January 07, 1858
MIDDLESEX gained small area from ESSEX when town of Reading gained from Lynnfield.
(Mass. Acts 1854, ch. 246, sec. 1/p. 163)
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April 23, 1838 -
April 10, 1854
MIDDLESEX lost to NORFOLK when town of Roxbury gained from Newton.
(Mass. Acts 1838, ch. 167, sec. 1/p. 481)
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March 27, 1835 -
April 23, 1838
MIDDLESEX exchanged with WORCESTER when towns of Holliston, Hopkinton, and Milford exchanged territory.
(Mass. Acts 1835, ch. 72/p. 382)
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March 03, 1829 -
March 27, 1835
MIDDLESEX exchanged with NORFOLK when town of Holliston gained from Medway.
(Mass. Acts 1829, ch. 125/p. 200 and ch. 133/p. 209)
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June 20, 1807 -
March 03, 1829
MIDDLESEX lost small area to WORCESTER when town of Northborough gained from Marlborough.
(Mass. Acts 1807, p. 52)
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June 22, 1797 -
June 20, 1807
MIDDLESEX exchanged with NORFOLK when the town of Natick exchanged with Needham.
(Mass. Acts 1797, ch. 22, sec. 1/p. 142)
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November 16, 1792 -
June 22, 1797
MIDDLESEX gained from WORCESTER when town of Ashby gained from Ashburnham.
(Mass. Acts 1792, ch. 2, sec. 1/p. 224)
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March 16, 1784 -
November 16, 1792
MIDDLESEX lost small area to WORCESTER when town of Berlin created from Marlborough, Northborough, and Bolton.
(Mass. Acts 1784, ch. 23, sec. 1/p. 98)
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February 25, 1783 -
March 16, 1784
MIDDLESEX gained from WORCESTER when town of Boxborough gained from Harvard.
(Mass. Acts 1783, ch. 8, sec. 1/p. 214)
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June 14, 1735 -
February 25, 1783
MIDDLESEX lost small area to WORCESTER when town of Upton created from Hopkinton.
(Mass. Col. Acts, vol. 2, ch. 11 [1735-1736], sec. 1/p. 764)
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June 29, 1732 -
June 14, 1735
MIDDLESEX exchanged with WORCESTER when town of Harvard created from Groton, Lancaster, and Stow.
(Mass. Col. Acts, vol. 2, ch. 4 [1732-1733], sec. 1/p. 644)
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July 10, 1731 -
June 29, 1732
MIDDLESEX lost to creation of WORCESTER.
(Mass. Col. Acts, vol. 2, ch. 8 [1730-1731], sec. 1/p. 584)
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May 10, 1643 -
July 10, 1731
MIDDLESEX created as one of four original counties in Massachusetts.
(Mass. Recs., 2:38)
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