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Tri-state area
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There are a number of places in the 48 contiguous United States known as tri-state areas where three states either meet at one point (a tripoint) or are in close proximity to each other.

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Encyclopedia
There are a number of places in the 48 contiguous United States known as tri-state areas where three states either meet at one point (a tripoint) or are in close proximity to each other. The two most well-known, although of the latter type, are for the New York and Chicago metropolitan areas. A well-known example of the former is Philadelphia's Delaware Valley.
The Tri-State Region around New York City is where New York, New Jersey, and Connecticut nearly meet. There is no tripoint, however, as Connecticut does not touch New Jersey. Chicago's tri-state region includes Illinois, Indiana, and Wisconsin and is commonly referred to as Chicagoland. This tri-state region also does not have a tripoint since Indiana does not touch Wisconsin. Philadelphia's tri-state area consists of Southeastern Pennsylvania, Southern New Jersey, and Delaware, with a tripoint meeting in the Delaware River near the east end of the Twelve-Mile Arc.
Other large metropolitan areas with a tri-state area include Cincinnati and Memphis.
The "Joplin District" Lead-Zinc Mining region of Oklahoma, Kansas and Missouri produced mineral specimens known as "Tri-State" minerals.
Land tripoints 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), there are 34 tripoints with or without markers on dry land. They are:
Water Tripoints There are another 28 places where the tripoint is under water:
| State 1 | State 2 | State 3 | Water | Notes |
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| 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 | Philadelphia, Pennsylvania metro area, at the east end of the Twelve-Mile Arc. | | 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 | | Illinois | Iowa | Missouri | Des Moines River and Mississippi River | | 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, Marion, Illinois metro area, and Paducah, Kentucky being its nuclei. | | Illinois | Michigan | Wisconsin | Lake Michigan | | Indiana | Kentucky | Ohio | Great Miami River and Ohio River | Cincinnati, Ohio metro area | | Iowa | Illinois | Missouri | Mississippi River and Des Moines River | Border with Lee County, Iowa | | Iowa | Minnesota | Wisconsin | Mississippi River | La Crosse, Wisconsin metro area. | | Iowa | Missouri | Nebraska | Missouri River | | Iowa | Nebraska | South Dakota | Big Sioux River and Missouri River | Sioux City, IA metro area. | | Kansas | Missouri | Nebraska | Missouri River | | Kentucky | Missouri | Tennessee | Mississippi River | 3 separate tripoints, due to meanders of the river (tho probably only a single tri-state area surrounding them all) | | Kentucky | Ohio | West Virginia | Big Sandy River and Ohio River | Huntington (WV)-Ashland (KY)-Ironton (OH) Tri-State region. | | Maryland | Virginia | West Virginia | Potomac River | Unmarked, at low water line, and almost always submerged. | | Michigan | Minnesota | Wisconsin | Lake Superior | | Minnesota | North Dakota | South Dakota | Bois de Sioux River | Not directly marked and most probably within river. | | New Jersey | New York | Pennsylvania | Delaware River | Purportedly marked on left bank but actually in middle of river. | | Ohio | Pennsylvania | West Virginia | Ohio River |
Regions with no Tripoint The following tri-state areas are also notable, but have no tripoint:
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