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Tri-state area is an informal term in the United States which can refer to any of multiple areas that lie across three states. When referring to populated areas, the term implies a shared economy or culture among the area's residents, typically concentrated around a central metropolis.

Tri-state areas may or may not include a state boundary tripoint.

Tri-state areas by region

The following is not an exhaustive list. "Tri-state area" may refer to several additional places in locally understood contexts, such as a business name.

Northeast

• The New York tri-state area, which includes parts of New York, New Jersey and Connecticut. Pennsylvania is sometimes included in the meaning of this usage of the term, since the New York metropolitan statistical area, as defined by the U.S. Census Bureau, includes a small part of the state of PA, but you still have to cross New Jersey or New York to access the state from Connecticut.
• The Philadelphia tri-state area, which includes parts of Pennsylvania, New Jersey, and Delaware. This use of "tri-state" excludes Maryland even though its northeast corner is closely tied to Philadelphia.
• The Pittsburgh tri-state area, covering parts of Pennsylvania, Ohio, and West Virginia.
• Maryland, Pennsylvania, West Virginia
• The Erie tri-state area, which includes parts of northwest Pennsylvania, Ohio and New York.
• The Minisink Valley tri-state area, which includes parts of New York, Pennsylvania and New Jersey.
• New York, Vermont and Massachusetts
• Vermont, New Hampshire, and Maine
• The Berkshires, a region usually considered to include only western Massachusetts and northwestern Connecticut; when the Taconic portion of New York is included, the area is sometimes described as the "tri-state" or "tri-corners" area.

Midwest

• The Chicago tri-state area, or "Chicagoland," which includes northeast Illinois, Northwest Indiana and southeast Wisconsin. The Tri-State Tollway connects Wisconsin's portion with Indiana's. Parts of southwest Michigan in the Michiana region are also culturally tied to Chicago.
• The Illinois–Indiana–Kentucky tri-state area, centered around the confluence of the Wabash and Ohio Rivers.
• The Cincinnati tri-state area, which includes parts of Ohio, Kentucky and Indiana.
• Kyova, a region named for Kentucky, Ohio and West Virginia and home to Tri-State Airport.
• The Dubuque tri-state area, which includes parts of Iowa, Illinois and Wisconsin.
• The Fort Madison-Keokuk tri-state area, also known as the Quincy tri-state area, which includes parts of Iowa, Illinois and Missouri.
• The Sioux City metropolitan area region of Iowa, Nebraska, and South Dakota.
• The La Crosse tri-state area, which includes parts of Wisconsin, Minnesota and Iowa.
• The Tri-State district, a lead and zinc mining region of Oklahoma, Kansas and Missouri, known for producing "tri-state" minerals consisting mainly of sphalerite.

South

• The DMV, which includes the city of Washington (coterminous with the District of Columbia) as well as surrounding portions of Maryland and Virginia. Although the District of Columbia is not a state, the region is sometimes referred to as a "tri-state area." Furthermore, the Washington–Arlington–Alexandria metropolitan statistical area, as defined by the U.S. Census Bureau, includes Jefferson County, West Virginia, making the region a true tri-state area.
• The Delmarva area, which includes Delaware and the eastern shores of Maryland and Virginia.
• Greater Memphis or the Mid-South, which includes west Tennessee, northwest Mississippi, and the Delta region of Arkansas.
• The Wiregrass Region, which includes southeast Alabama, southern Georgia and the Florida Panhandle.
• The Ark-La-Tex, a socioeconomic region that includes thirty-nine counties/parishes in Arkansas, Louisiana and Texas.
• The Southern Appalachian Tri-State Area, which includes portions of South Carolina, North Carolina, and Georgia, near the point where the three states converge. This region covers areas around Lake Hartwell and the Ellicott Rock Wilderness along the Chattooga River.

West

• The Inland Northwest, historically and alternatively known as the Inland Empire, which includes Washington, Idaho, and Oregon.
• The tri-state area of Bullhead City, Arizona; Needles, California; and Laughlin, Nevada.

See also

• List of tripoints of U.S. states
• Four Corners
• Four State Area
• Twin cities (geographical proximity), which includes tri-city
• Quad cities
• Three-Country Cairn, the tripoint where the borders of Norway, Sweden and Finland meet

References

1. Colby Itkowitz; Marissa J. Lang (March 20, 2020). "As U.S. coronavirus death toll surpasses 2,000, CDC issues travel advisory for hard-hit New York tri-state region". Washington Post. Retrieved June 19, 2024.
2. Justin Jouvenal (June 14, 2018). "A judge appears to be the first in Northern Virginia to drop cash bonds". Washington Post. Retrieved June 19, 2024. We live in a tri-state area
3. "Tri-State Leaders Plead for Gun Control, Up School Security After Texas Shooting". NBC New York. NBC New York. 2022-05-25. Retrieved 2022-05-26.
4. Carroll, Stephen C.; DeTurk, Richard (1968). Regional development guide guide : goals and plan for the Tri-State region. New York, N.Y: Tri-State Transportation Committee, 1968. Retrieved 2022-05-26.
5. King, Kate (2021-04-15). "Jobs Creep Back in the New York Region as Covid-19 Restrictions Ease". The Wall Street Journal. Retrieved 2022-05-26. Tri-state area's unemployment rate is still higher than national rate
6. Andone, Dakin; Maxouris, Christina (2020-03-28). "CDC issues travel advisory for New York tri-state area after coronavirus kills more than 2,000". CNN Health. Retrieved 2022-05-26. New York, New Jersey and Connecticut have been placed under a 14-day travel advisory
7. NYC Department of City Planning (2018-05-22). "City Planning Launches First Interactive Map With Population, Housing and Employment Statistics and Trends Across the Tri-state Area" (Press release). Retrieved 2022-05-26. That includes New York City, nearby portions of New York State, northern New Jersey and southwest Connecticut.
8. New York Governor's Office (2020-06-24). "Governor Cuomo, Governor Murphy and Governor Lamont Announce Joint Incoming Travel Advisory That All Individuals Traveling from States with Significant Community Spread of COVID-19 Quarantine for 14 Days" (Press release). Retrieved 2022-05-26. The tri-state measure will use uniform parameters and messaging on highways, airports, websites and social media across the three states.
9. "New York-Newark-Jersey City, NY-NJ-PA Metro Area". U.S. Census Bureau. 2022. Retrieved September 26, 2023 – via Census Reporter.
10. Charles Hillinger (October 8, 1987). "Maryland's Waist : Narrow Strip is Geographic Anomaly". Los Angeles Times. Retrieved June 19, 2024.
11. "Massachusetts-New York-Vermont Tri-State". The Corner Corner. Retrieved June 22, 2024.
12. Mendoza, Marie (July 28, 2023). "There's no 'New Yorkland' or 'Bostonland,' so why 'Chicagoland'?". WBEZ. Retrieved September 26, 2023.

• United States

• Geography of the United States
• Borders of U.S. states
• Border-related lists
• Border tripoints