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There are many metropolitan areas with three major constituent cities that go by the name of Tri-Cities, generally unofficially. They include:
United States 
- The Tri-Cities, Washington, consisting of Richland, Pasco, and Kennewick, Washington, along the banks of the Columbia River
- The Tri-Cities, Tennessee, Tennessee and Virginia, consisting of the twin cities of Bristol, Tennessee/Bristol, Virginia, Kingsport, and Johnson City
- The Research Triangle in North Carolina, consisting of Raleigh, Durham, and Chapel Hill.
- The Golden Triangle in Texas, consisting of Beaumont, Port Arthur, and Orange.
- The Piedmont Triad in North Carolina, consisting of Greensboro, Winston-Salem (itself a merged city), and High Point.
- The Tri-Cities in Michigan, consisting of Bay City, Saginaw, and Midland in the Saginaw Valley
- In Illinois and Iowa: three of the four Quad Cities—Moline and Rock Island in Illinois and Davenport in Iowa—were formerly known as the Tri-Cities, before the inclusion of East Moline, Illinois and later, Bettendorf, Iowa
- In Kane County, Illinois, the county seat of Geneva and the nearby cities of Batavia, and St. Charles,
- The Capital District in New York, consisting of Albany, Schenectady, and Troy
- In Colorado: the towns of Firestone, Frederick, and Dacono (known as the "tri-towns")
- In Nebraska:
- Tri-Cities, Virginia, consisting of Petersburg, Colonial Heights, and Hopewell in the Greater Richmond Region
- In New Hampshire: Dover, Somersworth, and Rochester in the Seacoast Region
- In Florida:
- In the southeast of the state, South Florida, consisting of the anchor cities of Miami, Fort Lauderdale, and West Palm Beach. This region is sometimes referred to as the tri-county area (Dade, Broward, and Palm Beach counties)
- On the Gulf of Mexico Coast, the Tampa Bay Area, consisting of Tampa, Clearwater, and St. Petersburg
- In Oklahoma: Tuttle, Newcastle, and Blanchard (sometimes with the town of Bridge Creek)
- In California:
- The San Francisco Bay Area, anchored by the cities of San Francisco, Oakland and San Jose.
- In Alameda County: Fremont, Newark, and Union City are referred to as the Tri-City Area.
- In Santa Barbara County: Santa Barbara, Goleta, and Carpinteria, sometimes referred collectively as the South Coast. The term 'tri-cities' is only rarely used as a reference to them, and is considered somewhat old.
- In San Diego County: Oceanside, Vista, and Carlsbad are sometimes referred to as the tri-cities.
- The Triple Cities in New York: Binghamton, Endicott and Johnson City
- The Lehigh Valley in Pennsylvania: Allentown, Bethlehem, and Easton
- In Alabama: Huntsville, Decatur, and Athens
- Tri-Cities (British Columbia), consisting of Coquitlam, Port Coquitlam, and Port Moody, located in the north-eastern section of Metro Vancouver.
- Kitchener, Waterloo, and Cambridge, Ontario. (Cambridge, Ontario, itself is the "tri-city" amalgamation of the City of Galt, and the towns of Preston and Hespeler, and the hamlet of Blair in 1973.)
- Torreón, Coahuila, Gómez Palacio and Lerdo, Durango — see also Comarca Lagunera
- Monterrey and San Nicolás de los Garza, Nuevo León
- Monterrey and San Pedro Garza García
- Monterrey and Guadalupe, Nuevo León
- Monterrey and Escobedo, Nuevo León
- Monterrey and Santa Catarina, Nuevo León
- Saltillo and Ramos Arizpe, Coahuila
- Piedras Negras, Coahuila and Eagle Pass, Texas
- Ciudad Acuña, Coahuila and Del Rio, Texas
- Tampico, Ciudad Madero and Altamira, in Tamaulipas.
- Arcot, Ranipet and Walajapet towns in Tamil Nadu
- Warangal in India, Andhra Pradesh consists of the towns of Warangal, Hanamakonda, and Kazipet.
- The second Tricity in North India consists of the towns of Chandigarh, Panchkula and SAS Nagar (Mohali).
- Tricity of Nepal consists of the cities of Baglung, Beni and Kusma along with several towns and villages along the Kali Gandaki valley.
- Dhahran, Dammam and Khobar in Saudi Arabia
South America 
- The Tricity in Poland consists of Gdańsk, Gdynia and Sopot
- The cities of Oxford, Cambridge and London are sometimes considered as a tricity of scientific excellence connected by good rail or road connections.
- The cities of Wakefield, Leeds and Bradford all form part of the West Yorkshire Urban Area
See also 
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