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.[1] 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.
| State 1 | State 2 | State 3 | Coordinates | Notes | |
|---|---|---|---|---|---|
| Alabama | Florida | Georgia | 31.0006°N -85.0022°W | Marker on Chattahoochee riverbank is actually a few feet above and west of true tripoint at high-water line.[2] | |
| Alabama | Georgia | Tennessee | 34.9847°N -85.6053°W | 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.[3] [4] [5] | |
| Arizona | Nevada | Utah | 37.0003°N -114.0506°W | Marked with a red sandstone monument.[6] | |
| Arkansas | Louisiana | Mississippi | 33.0042°N -91.1661°W | Probably unmarked on silt island in river sometimes connected to west bank by mud flat accreted by riprap. | |
| Arkansas | Louisiana | Texas | 33.0192°N -94.0431°W | See Ark-La-Tex. Marker in process of being surrounded and absorbed by tree. | |
| Arkansas | Missouri | Oklahoma | 36.4994°N -94.6181°W | Marked with a stone monument.[7] | |
| Arkansas | Oklahoma | Texas | 33.6378°N -94.4858°W | 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 | 41.9944°N -119.9992°W | Marked with a cairn.[8] | |
| Colorado | Kansas | Nebraska | 40.0031°N -102.0517°W | Marked with a brass disc.[9] | |
| Colorado | Kansas | Oklahoma | 36.9931°N -102.0422°W | 8 Mile Corner. Marker is concealed in crypt beneath removable manhole cover. | |
| Colorado | Nebraska | Wyoming | 41.0014°N -104.0533°W | Marked with a stone surrounded by a three-stone colored base.[10] | |
| Colorado | New Mexico | Oklahoma | 37°N -103.0022°W | Preston Monument | |
| Colorado | Utah | Wyoming | 41.0006°N -109.05°W | Marked.[11] | |
| Connecticut | Massachusetts | New York | 42.0497°N -73.4872°W | See Brace Mountain or Mount Frissell. Marked with a stone inscribed with MASS-1898-NY and sometimes a "scratched-on" CONN.[12] | |
| Connecticut | Massachusetts | Rhode Island | 42.0081°N -71.7992°W | See Thompson, Connecticut. Marked with a stone inscribed with MASS-CONN-RI.[13] | |
| Delaware | Maryland | Pennsylvania | 39.7222°N -75.7886°W | See Delaware Wedge. Marked with a stone inscribed with M-M-P-P, as this was not the original intended tri-point.[14] | |
| Georgia | North Carolina | Tennessee | 34.9883°N -84.3219°W | Marked.[15] | |
| Idaho | Montana | Wyoming | 44.4742°N -111.0489°W | Located within Yellowstone National Park. Marked, although difficult to access.[16] | |
| Idaho | Nevada | Oregon | 42.0003°N -117.0261°W | Marked with a three-sided stone inscribed with N-I-O on the respective faces.[17] | |
| Idaho | Nevada | Utah | 41.9936°N -114.0417°W | Marked with a granite monument inscribed with the respective states' names.[18] | |
| Idaho | Utah | Wyoming | 42.0017°N -111.0467°W | Marked with a stone.[19] | |
| Indiana | Michigan | Ohio | 41.6961°N -84.8061°W | 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[20] and is referenced by a granite marker 20 feet to the east on the Michigan-Ohio line.[21] | |
| Iowa | Minnesota | South Dakota | 43.5003°N -96.4533°W | True point is marked with a disc in the center of a T-shaped road intersection.[22] A witness monument nearby in the South Dakota corner acknowledges the tri-point being set in 1859. | |
| Kansas | Missouri | Oklahoma | 36.9989°N -94.6181°W | Marked with a plaque on a seldom used dead-end road.[23] | |
| Kentucky | Tennessee | Virginia | 36.6008°N -83.6756°W | Tri-State Peak[24] Located within Cumberland Gap National Historical Park. Marked. | |
| Kentucky | Virginia | West Virginia | 37.5381°N -81.9681°W | Marked with a USCG marker on top of a two-foot high iron pipe at the river's high point.[25] | |
| Maryland | Pennsylvania | West Virginia | 39.7211°N -79.4767°W | Marked with a pyramid-like stone.[26] | |
| Massachusetts | New Hampshire | Vermont | 42.7269°N -72.4583°W | Marker is technically on dry land, but buried within river bed due to a dam's construction downstream.[27] | |
| Massachusetts | New York | Vermont | 42.7458°N -73.265°W | Marked with a stone.[28] | |
| Minnesota | North Dakota | South Dakota | 45.9353°N -96.5636°W | Near the Bois de Sioux River[29] | |
| Montana | North Dakota | South Dakota | 45.9453°N -104.0456°W | Marked with a red granite stone.[30] | |
| Montana | South Dakota | Wyoming | 44.9975°N -104.0578°W | Marked with a stone within a fence.[31] | |
| Nebraska | South Dakota | Wyoming | 43.0006°N -104.0531°W | Marked with a stone within a fence.[32] | |
| New Jersey | New York | Pennsylvania | 41.3575°N -74.695°W | Marked by the Tri-States Monument in Port Jervis, New York, at the confluence of the Delaware and Neversink rivers.[33] [34] | |
| New Mexico | Oklahoma | Texas | 36.5003°N -103.0025°W | Texhomex Marker | |
| North Carolina | Tennessee | Virginia | 36.5881°N -81.6775°W | North Carolina–Tennessee–Virginia Corners - Marked.[35] |
