This is a list of all tripoints in which the boundaries of three (and only three) U.S. states converge at a single geographic point. Of the 60 such points, 36 are on dry land and 24 are in water. Of the points in water, 3 are in the Great Lakes and thus have no land nearby. A tripoint occurring in a populated area may also be informally described as a tri-state area.
While most U.S. states form at least one tripoint, the states of Alaska, Hawaii, and Maine do not form any. The only U.S. state Maine shares a border with is New Hampshire while Alaska and Hawaii do not border any other U.S. states.
Land
State 1State 2State 3CoordinatesNotes Alabama Florida Georgia Marker on Chattahoochee riverbank is actually a few feet above and west of true tripoint at high-water line. Alabama Georgia Tennessee Tri-State Corner. Marker on dry land at surface level and unmarked on lake in cavern directly below. Stolen in 2009 and returned two years later. Arizona Nevada Utah Marked with a red sandstone monument. Arkansas Louisiana Mississippi Probably unmarked on silt island in river sometimes connected to west bank by mud flat accreted by riprap. Arkansas Louisiana Texas Located in the Three States unincorporated community. Marker in process of being surrounded and absorbed by tree. See also: Ark-La-Tex Arkansas Missouri Oklahoma Marked with a stone monument. Arkansas Oklahoma Texas Unmarked 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. California Nevada Oregon Marked with a cairn. Colorado Kansas Nebraska Marked with a brass disc. Colorado Kansas Oklahoma 8 Mile Corner. Marker is concealed in crypt beneath removable manhole cover. Colorado Nebraska Wyoming Marked with a stone surrounded by a three-stone colored base. Colorado New Mexico Oklahoma Preston Monument Colorado Utah Wyoming Marked. Connecticut Massachusetts New York See Brace Mountain or Mount Frissell. Marked with a stone inscribed with MASS-1898-NY and a scratched-on CONN. Connecticut Massachusetts Rhode Island See Thompson, Connecticut. Marked with a stone inscribed with MASS-CONN-RI. Delaware Maryland Pennsylvania Marked by the Tri-State Monument, inscribed with M-M-P-P. See Delaware Wedge. Georgia North Carolina Tennessee Marked. Idaho Montana Wyoming Located within Yellowstone National Park. Marked, although difficult to access. Idaho Nevada Oregon Marked with a three-sided stone inscribed with N-I-O on the respective faces. Idaho Nevada Utah Marked with a granite monument inscribed with the respective states' names. Idaho Utah Wyoming Marked with a stone. Indiana Michigan Ohio Brass marker with the shapes of the three states is located in a monument box beneath the surface of a rural road. Was set in 1999 and is referenced by a granite marker 20 feet to the east on the Michigan-Ohio line. Iowa Minnesota South Dakota True point is marked with a disc in the center of a T-shaped road intersection. A witness monument nearby in the South Dakota corner acknowledges the tri-point being set in 1859. Kansas Missouri Oklahoma Marked with a plaque on a seldom used dead-end road. Kentucky Tennessee Virginia Tri-State Peak Located within Cumberland Gap National Historical Park. Marked. Kentucky Virginia West Virginia Marked with a USCG marker on top of a two-foot high iron pipe at the river's high point. Maryland Pennsylvania West Virginia Marked with a pyramid-like stone. Massachusetts New Hampshire Vermont Marker is technically on dry land, but buried within river bed due to a dam's construction downstream.Eric Jones. New Hampshire Curiosities. Globe Pequot, 2006. p. 114-5 Massachusetts New York Vermont Marked with a stone. Minnesota North Dakota South Dakota Near the Bois de Sioux River Montana North Dakota South Dakota Marked with a red granite stone. Montana South Dakota Wyoming Marked with a stone within a fence. Nebraska South Dakota Wyoming Marked with a stone within a fence. New Jersey New York Pennsylvania Marked by the Tri-States Monument in Port Jervis, New York, at the confluence of the Delaware and Neversink rivers. New Mexico Oklahoma Texas Texhomex Marker North Carolina Tennessee Virginia North Carolina–Tennessee–Virginia Corners - Marked.
Water
State 1State 2State 3CoordinatesWaterNotes Alabama Mississippi Tennessee Tennessee River Arizona California Nevada Colorado River Arkansas Mississippi Tennessee Mississippi River Memphis, Tennessee metro area. Arkansas Missouri Tennessee Mississippi River Connecticut New York Rhode Island Long Island Sound The part of New York that is in this tri-state area is Fishers Island. It is the New London, Connecticut metro area. Delaware New Jersey Pennsylvania Delaware River Georgia North Carolina South Carolina Chatooga River Located in river very near marker on dry land. Idaho Oregon Washington Snake River Illinois Indiana Kentucky Wabash River and Ohio River Evansville, Indiana metro area. See Illinois–Indiana–Kentucky tri-state area. Illinois Indiana Michigan Lake Michigan Known as either the Indiana Dunes or the Michigan Dunes Area Illinois Iowa Wisconsin Mississippi River Dubuque, Iowa metro area. Illinois Kentucky Missouri Mississippi River and Ohio River Little Egypt region popularly labeled as a tri-state area with St. Louis, Missouri, Carbondale, Illinois metro area and Paducah, Kentucky being its nuclei. Illinois Michigan Wisconsin Lake Michigan Indiana Kentucky Ohio Ohio River Cincinnati metro area. The tripoint is near, but not precisely at, the confluence with the Great Miami River. Iowa Illinois Missouri Mississippi River and Des Moines River Border with Lee County, Iowa Iowa Minnesota Wisconsin Mississippi River La 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. Iowa Missouri Nebraska Missouri River Iowa Nebraska South Dakota Big Sioux River and Missouri River Sioux City, Iowa metro area. Kansas Missouri Nebraska Missouri River Kentucky Missouri Tennessee Mississippi River Three separate tripoints, due to meanders of the river (though probably only a single tri-state area surrounding them all). See also Kentucky Bend. Kentucky Ohio West Virginia Big Sandy River and Ohio River Huntington (W.V.)-Ashland (Ky.)-Ironton (Oh.) Tri-State region. Maryland Virginia West Virginia Potomac River Unmarked, at high water mark, because the Maryland West Virginia state line is at the high water mark even tho the Maryland Virginia state line runs generally along the low water line, so perhaps misclassified here because it is rarely actually under water. Michigan Minnesota Wisconsin Lake Superior Ohio Pennsylvania West Virginia Ohio River Technically 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.
See also Four Corners Monument – a quadripoint between the states of Arizona, Colorado, New Mexico, and Utah
References
External links