Tri-state area

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There are a number of areas in the 48 contiguous United States known informally as tri-state areas. A tri-state area is an area associated with a particular town or metropolis that lies across three states. Some, but not all, of these involve a state boundary tripoint.

The most frequently referenced tri-state area is that associated with the New York metropolitan area, which covers parts of the states of New York, New Jersey and Connecticut. It is often referenced in New York radio, as well as through countless television commercials.

The Delaware Valley region, which includes eastern Pennsylvania, southern New Jersey, and northern Delaware, is also frequently referred to as a tri-state area in radio and TV advertising in the Philadelphia market.

Four other prominent areas that have been labeled tri-state areas are the Cincinnati tri-state area, including Ohio, Kentucky, and Indiana; the Pittsburgh tri-state area, covering parts of Pennsylvania, Ohio, and West Virginia; the Chicago tri-state area, also known as Chicagoland, which includes Illinois, Indiana, and Wisconsin; and the Greater Memphis area or Mid-South consisting of West Tennessee, North Mississippi, and the Arkansas delta.

Smaller tri-state areas include those of Dubuque, Iowa, which spills over into Illinois and Wisconsin; of Quincy, Illinois, which includes parts of Missouri and Iowa; Evansville, Indiana, which includes parts of Illinois and Kentucky; the Chattanooga, Tennessee tri-state area which includes Alabama and Georgia; and the Huntington (W.V.)-Ashland (Ky.)-Ironton (Oh.) Tri-State region, which incorporates areas of Kentucky, Ohio, and West Virginia. The Quincy, Evansville, and Huntington-Ashland areas are noteworthy for the states included all being separated by rivers.

The area that includes Washington, D.C. and the nearby parts of Maryland and the Virginias is sometimes loosely referred to as a "tri-state area," although the District of Columbia is not a state; however, with the presence of Jefferson County, West Virginia in the official Washington–Arlington–Alexandria Metropolitan Statistical Area, the region, as defined by the US Government, does in fact include three states. This area is more commonly/colloquially referred to as the "DMV" (DC, Maryland, Virginia).

The "Joplin District", a lead and zinc mining region of Oklahoma, Kansas and Missouri, produced mineral specimens known as "Tri-State" minerals, typically consisting mainly of sphalerite.



Of the 62 points in the United States where three and only three states meet (each of which may be associated with its own tri-state area), 35 are on dry land, 27 are in water.[1]

NY-MA-CT Tripoint Marker
CT-RI-MA Tripoint Marker
NJ-NY-PA Tripoint Marker
IN-MI-OH Tripoint Marker
State 1State 2State 3Notes
AlabamaFloridaGeorgiaMarker on riverbank is actually a few feet above and west of true tripoint at high-water line.
AlabamaGeorgiaTennesseeRecently[when?] stolen marker on dry land at surface level and unmarked on lake in cavern directly below.
ArizonaNevadaUtahMarked with a red sandstone monument.[2]
ArkansasLouisianaMississippiUnmarked on silt island in river connected to west bank by riprap.
ArkansasLouisianaTexasSee Ark-La-Tex. Marker in process of being surrounded and absorbed by tree.
ArkansasMissouriOklahomaMarked with a stone monument.[3]
ArkansasOklahomaTexasUnmarked on seasonal silt island or in river bed, but Oklahoma-Texas state line as revised in 2000 is defective in not extending from vegetation line on south bank to pre-established tripoint.
CaliforniaNevadaOregonMarked with a cairn.[4]
ColoradoKansasNebraskaMarked with a brass disc.[5]
ColoradoKansasOklahoma8 Mile Corner. Marker is concealed in crypt beneath removable manhole cover.
ColoradoNebraskaWyomingMarked with a stone surrounded by a three-stone colored base.[6]
ColoradoNew MexicoOklahomaPreston Monument
ConnecticutMassachusettsNew YorkSee Brace Mountain or Mount Frissell. Marked with a stone inscribed with MASS-1898-NY and sometimes a "scratched-on" CONN.[8]
ConnecticutMassachusettsRhode IslandSee Thompson, Connecticut. Marked with a stone inscribed with MASS-CONN-RI.[9]
DelawareMarylandPennsylvaniaSee Delaware Wedge. Marked with a stone inscribed with M-M-P-P as this was not intended to be the original tri-point.[10]
GeorgiaNorth CarolinaTennesseeMarked.[11]
IdahoMontanaWyomingLocated within Yellowstone National Park. Marked, although difficult to access.[12]
IdahoNevadaOregonMarked with a three-sided stone inscribed with N-I-O on the respective faces.[13]
IdahoNevadaUtahMarked with a granite monument inscribed with the respective states' names.[14]
IdahoUtahWyomingMarked with a stone.[15]
IndianaMichiganOhioMarker is located in a monument box beneath the surface of a rural road. Was set in 1999[16] and used to have a removable metal plate protecting it.[17]
IowaMinnesotaSouth DakotaTrue point is marked with a disc in the center of a T-shaped road intersection.[18] A witness monument nearby in the South Dakota corner acknowledges the tri-point being set in 1859.
KansasMissouriOklahomaMarked with a plaque on a seldom used dead-end road. Apparently a teenagers' backwoods drinking spot.[19]
KentuckyTennesseeVirginiaTri-State Peak[20] Located within Cumberland Gap National Historical Park. Marked.
KentuckyVirginiaWest VirginiaMarked with a USGS marker on top of a two-foot high iron pipe at the river's high point.[21]
MarylandPennsylvaniaWest VirginiaMarked with a pyramid-like stone.[22]
MassachusettsNew HampshireVermontMarker is technically on dry land, but buried within river bed due to a dam's construction downstream.[23]
MassachusettsNew YorkVermontMarked with a stone.[24]
MontanaNorth DakotaSouth DakotaMarked with a red granite stone.[25]
MontanaSouth DakotaWyomingMarked with a stone within a fence.[26]
NebraskaSouth DakotaWyomingMarked with a stone within a fence.[27]
New JerseyNew YorkPennsylvaniaMarked by the Tri-State Monument in Port Jervis, New York by the confluence of the Delaware and Neversink Rivers.[28]
New MexicoOklahomaTexasTexomex Marker
North CarolinaTennesseeVirginiaMarked.[29]


State 1State 2State 3WaterNotes
AlabamaMississippiTennesseeTennessee River
ArizonaCaliforniaNevadaColorado River
ArkansasMississippiTennesseeMississippi RiverMemphis, Tennessee metro area.
ArkansasMissouriTennesseeMississippi River
ConnecticutNew YorkRhode IslandLong Island SoundThe part of New York that is in this tri-state area is Fishers Island. It is the New London, Connecticut metro area.
DelawareNew JerseyPennsylvaniaDelaware RiverPhiladelphia metro area, at the east end of the Twelve-Mile Circle.
GeorgiaNorth CarolinaSouth CarolinaChatooga RiverLocated in river very near marker on dry land.
IdahoOregonWashingtonSnake River
IllinoisIndianaKentuckyWabash River and Ohio RiverEvansville, Indiana metro area. See Illinois-Indiana-Kentucky Tri-State Area.
IllinoisIndianaMichiganLake MichiganKnown as either the Indiana Dunes or the Michigan Dunes Area
IllinoisIowaWisconsinMississippi RiverDubuque, Iowa metro area.
IllinoisKentuckyMissouriMississippi River and Ohio RiverLittle Egypt region popularly labeled as a tri-state area with St. Louis, Missouri, Carbondale, Illinois metro area, and Paducah, Kentucky being its nuclei.
IllinoisMichiganWisconsinLake Michigan
IndianaKentuckyOhioOhio RiverCincinnati, Ohio metro area. The tripoint is near, but not precisely at, the confluence with the Great Miami River.
IowaIllinoisMissouriMississippi River and Des Moines RiverBorder with Lee County, Iowa
IowaMinnesotaWisconsinMississippi RiverLa Crosse, Wisconsin metro area. Was apparently marked at one time with a sign that had been anchored in the location, but that sign has since been moved as of 2001.[30]
IowaMissouriNebraskaMissouri River
IowaNebraskaSouth DakotaBig Sioux River and Missouri RiverSioux City, Iowa metro area.
KansasMissouriNebraskaMissouri River
KentuckyMissouriTennesseeMississippi RiverThree separate tripoints, due to meanders of the river (though probably only a single tri-state area surrounding them all). See also Kentucky Bend.
KentuckyOhioWest VirginiaBig Sandy River and Ohio RiverHuntington (W.V.)-Ashland (Ky.)-Ironton (Oh.) Tri-State region.
MarylandVirginiaWest VirginiaPotomac RiverUnmarked, at low water line, and almost always submerged.
MichiganMinnesotaWisconsinLake Superior
MinnesotaNorth DakotaSouth DakotaBois de Sioux RiverNot directly marked and most probably within river.
OhioPennsylvaniaWest VirginiaOhio RiverTechnically the Beginning Point of the U.S. Public Land Survey, although the actual monument is 1,112 feet north of the tripoint due to the tripoint's current location under water; Pittsburgh Tri-State.

Regions with no Tripoint[edit]

The following tri-state areas are also notable, but have no tripoint:

State 1State 2State 3Notes
AlabamaFloridaMississippiThe Gulf Coast region.
ConnecticutNew JerseyNew YorkNew York metropolitan area. See New York Metropolitan Area.
DelawareMarylandNew JerseyWilmington, DE metropolitan area
DelawareMarylandVirginiaDelmarva Peninsula
IdahoMontanaWashingtonSpokane, WA area; connected by Interstate 90
IllinoisIndianaWisconsinChicago metro area
KansasOklahomaTexasThe Liberal, Kansas area has a close relationship with the Oklahoma and Texas panhandles.
MassachusettsMaineNew HampshireThe Boston to Portland metro area; though the two are separated by New Hampshire, Maine was actually part of Massachusetts before becoming a separate state in 1820.
New YorkPennsylvaniaOhioErie metropolitan area, a.k.a. Niagara Frontier and North Coast. Shares two tripoints with Ontario (PA-ON-OH and PA-ON-NY), both within Lake Erie.
South CarolinaNorth CarolinaTennesseeThe Spartanburg, South Carolina, Asheville, North Carolina, Johnson City, Tennessee, and Kingsport, Tennessee metro areas along Interstate 26
VermontMaineNew HampshireNorthern New England
West VirginiaVirginiaNorth CarolinaImportant section of Interstate 77 connecting Charleston, West Virginia with Charlotte, North Carolina; passes through Wytheville, Virginia

See also[edit]


  1. ^ "Tri State Corners in the United States". Jack Parsell. 
  2. ^ AZ-NV-UT Corner
  3. ^ AR-MO-OK Corner
  4. ^ CA-NV-OR Corner
  5. ^ CO-KS-NE Corner
  6. ^ CO-NE-WY Corner
  7. ^ CO-UT-WY Corner
  8. ^ CT-MA-NY Corner
  9. ^ CT-MA-RI Corner
  10. ^ DE-MD-PA Corner
  11. ^ GA-NC-TN Corner
  12. ^ ID-MT-WY Corner
  13. ^ ID-NV-OR Corner
  14. ^ ID-NV-UT Corner
  15. ^ ID-UT-WY Corner
  16. ^ Jack Parsell's description of the IN-MI-OH tripoint
  17. ^
  18. ^ Photo by Gregg A. Butler of the IA-MN-SD tripoint and its witness post
  19. ^ KS-MO-OK Corner
  20. ^ KY-TN-VA Tri-State Peak at Cumberland Gap National Historical Park
  21. ^ KY-VA-WV Corner
  22. ^ MD-PA-WV Corner
  23. ^ Eric Jones. New Hampshire Curiosities. Globe Pequot, 2006. p114-5.
  24. ^ MA-NY-VT Corner
  25. ^ MT-ND-SD Corner
  26. ^ MT-SD-WY Corner
  27. ^ NE-SD-WY Corner
  28. ^ NJ-NY-PA Corner
  29. ^ NC-TN-VA Corner
  30. ^

External links[edit]