This includes (but is not limited to) counties that were renamed but retained their territorial integrity, or counties that were transferred wholesale to another state when it was separated from another state ( Massachusetts counties transferred to Maine ; Virginia counties transferred to West Virginia ).
- Washington County, D.C. Abolished in 1871. Under the current (2001, revised through 2005) District of Columbia Code, the entire District of Columbia is a single body corporate for municipal purposes; the code does not mention Washington County except to make the District of Columbia the successor in title to its property.
- Alexandria County, D.C.
- Bancroft County, Iowa was established in 1851. It was abolished in 1857 and the area was joined to Kossuth County .
- Crocker County, Iowa , was created in 1870 out of Kossuth County from portions of what had been Bancroft County . It was merged back into Kossuth County in 1871.
- Des Moines County, Michigan Territory , became part of Wisconsin Territory , now Des Moines County, Iowa
- Dubuque County, Michigan Territory , became part of Wisconsin Territory , now Dubuque County, Iowa
''See also Virginia & Virginia Colony , below''
''See List Of Parishes Of Louisiana ''
''See also Massachusetts , below.''
- Charles County : formed in 1650 from part of Saint Mary's County. Abolished in 1654. Referred to as Old Charles County.
- 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.
Most Massachusetts county governments were abolished between 1997 and 2000, with the exception of Barnstable , Bristol , Dukes , Nantucket , Norfolk , and Plymouth Counties . The counties remain as legal venues, and the remaining countywide elective offices became part of state government.
- Brown County, Michigan Territory , became part of Wisconsin Territory now remains as Brown County, Wisconsin
- Crawford County, Michigan Territory , became part of Wisconsin Territory , now Crawford County, Wisconsin
- Des Moines County, Michigan Territory , became part of Wisconsin Territory , now Des Moines County, Iowa
- Dubuque County, Michigan Territory , became part of Wisconsin Territory , now Dubuque County, Iowa
- Illinois County, Virginia , formed in 1778 and constituted most of present-day Illinois , Indiana , Michigan , Ohio , and Wisconsin ; abolished 5 January 1782 ; territory ceded by Virginia to Congress in March 1784 ; see Illinois Country .
- Iowa County, Michigan Territory , became part of Wisconsin Territory , now Iowa County, Wisconsin
- Isle Royale County, Michigan , abolished in 1897 to become part of Keweenaw County, Michigan
- Manitou County, Michigan , abolished in 1895 and to become part of Charlevoix County, Michigan and Leelanau County, Michigan
- Milwaukee County, Michigan Territory , became part of Wisconsin Territory , now Milwaukee County, Wisconsin
- Omeena County, Michigan , 1840-1853, abolished, and integrated into Grand Traverse County
- Washington County, Michigan , formed in 1867 from Marquette County, Michigan but declared unconstitutional
- Charlotte County, Province Of New York (renamed and partitioned). See Washington County, New York .
- Cornwall County, Province Of New York (transferred to Massachusetts in 1686).
- Cumberland County, Province Of New York (claimed by and transferred to Vermont , unclear if ever implemented or administered). See Albany County, New York .
- Dukes County, Province Of New York (transferred to Massachusetts in 1691).
- Gloucester County, New York (claimed by and transferred to Vermont , unclear if ever implemented or administered).
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- Yorkshire County, Province Of New York (original English county, partitioned in 1683 into Kings, Queens (including modern Nassau), Suffolk, Richmond and Westchester (including modern Bronx) counties.)
- Albemarle County, North Carolina
- Bath County, North Carolina
- Bute County, North Carolina
- Dobbs County, North Carolina
- Glasgow County, North Carolina
- Tennessee County, Tennessee (1796) - A North Carolina county that was renamed Montgomery County, Tennessee when Tennessee achieved statehood to lessen confusion.
- Tryon County, North Carolina
- Washington County, North Carolina (1788–1796), present-day Tennessee
- Greer County, Texas (1888-1895, transferred to Oklahoma Territory under a Supreme Court decision)
- Miller County, Arkansas Territory (1820-1825, became part of Indian Territory and present-day Texas )
- Santa Fe County, Texas (1848-1850, abolished November 25, 1850; land ceded to United States in compliance with Compromise Of 1850 )
- Worth County, Texas (1850, formed from part of Santa Fe County, abolished November 25, 1850; land ceded to United States in compliance with Compromise Of 1850 )
''See also'' Lost Counties, Cities And Towns Of Virginia .
- Alexandria County, D.C. ( Retroceded To Virginia , most of which now comprises Arlington County, Virginia with a portion becoming part of Alexandria, Virginia )
- Elizabeth City County, Virginia (incorporated into the Independent City of Hampton in 1952 )
- Fincastle County, Virginia (land now part of Kentucky)
- Illinois County, Virginia , formed in 1778 and constituted most of present-day Ohio , Indiana , Illinois , Michigan , and Wisconsin ; abolished 5 January 1782 ; territory ceded by Virginia to Congress in March 1784 ; see Illinois Country .
- Kentucky County, Virginia (1777-1780, land that later became the state of Kentucky in 1792 )
- Lower Norfolk County (Colonial Virginia) (in 1691, divided into Norfolk County, Virginia and Princess Anne County, Virginia
- Nansemond County, Virginia became Independent City of Nansemond in 1972 ; merged with independent city of Suffolk in 1974
- New Norfolk County (Colonial Virginia) Formed in 1636 from Elizabeth River Shire , divided into Lower Norfolk County and Upper Norfolk County in 1637
- Norfolk County, Virginia Formed in 1691 from part of Lower Norfolk County , was merged with Independent City of South Norfolk to become new Independent City of Chesapeake in 1963
- Old Rappahannock County, Province Of Virginia
- Princess Anne County, Virginia (Formed in 1691 from part of Lower Norfolk County , was merged with Independent City of Virginia Beach in 1963 )
- Upper Norfolk County (Colonial Virginia) (renamed Nansemond County in 1642; see Nansemond County for subsequent history)
- Warwick River County, Virginia (renamed Warwick County in 1642; became Independent City of Warwick in 1952 ; merged with City of Newport News in 1958 )
- Yohogania County, Virginia (1776-1779, land now in Pennsylvania)
''See Virginia & Virginia Colony , above''
- Brown County, Michigan Territory , became part of Wisconsin Territory now remains as Brown County, Wisconsin
- Crawford County, Michigan Territory , became part of Wisconsin Territory , now Crawford County, Wisconsin
- Des Moines County, Michigan Territory , became part of Wisconsin Territory , now Des Moines County, Iowa
- Dubuque County, Michigan Territory , became part of Wisconsin Territory , now Dubuque County, Iowa
- Illinois County, Virginia , formed in 1778 and constituted most of present-day Illinois , Indiana , Michigan , Ohio , and Wisconsin ; abolished 5 January 1782 ; territory ceded by Virginia to Congress in March 1784 ; see Illinois Country .
- Iowa County, Michigan Territory , became part of Wisconsin Territory , now Iowa County, Wisconsin
- Milwaukee County, Michigan Territory , became part of Wisconsin Territory , now Milwaukee County, Wisconsin
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