Tri-Cities
- Ahmedabad
- Amaravati
- Atlanta Hawks
- Avadi
- Aztec, New Mexico
- Bay City, Michigan
- Blanchard, Oklahoma
- Bloomfield, New Mexico
- Burbank, California
- Capital District, New York
- Carlsbad, California
- Chandigarh Tricity
- Chennai
- Chennai Metropolitan Area
- College Park, Georgia
- Dammam metropolitan area
- Dubai-Sharjah-Ajman metropolitan area
- Dublin, California
- East Point, Georgia
- Electrolux
- Farmington, New Mexico
- Ferrysburg, Michigan
- Fremont, California
- GIFT City
- Gandhinagar
- Glendale, California
- Golden Triangle (Texas)
- Grand Haven, Michigan
- Hapeville, Georgia
- Hartsfield–Jackson Atlanta International Airport
- Historic Triangle
- Lehigh Valley
- Little Kashubian Tricity
- Livermore, California
- Los Angeles County, California
- Lysychansk
- Midland, Michigan
- Mumbai
- Mumbai Metropolitan Area
- Navi Mumbai
- Newark, California
- Newcastle, Oklahoma
- Oceanside, California
- Pasadena, California
- Piedmont Triad
- Pleasanton, California
- Quad Cities
- Ranipet
- Research Triangle
- Rubizhne
- Saginaw, Michigan
- Saginaw, Midland, and Bay City metropolitan area
- San Francisco Bay Area
- San Ramon, California
- Sievierodonetsk
- Spring Lake, Michigan
- Tambaram
- Thane
- Three Towns
- Tri-Cities (British Columbia)
- Tri-Cities (Michigan)
- Tri-Cities (Ontario)
- Tri-Cities (Tennessee–Virginia)
- Tri-Cities metropolitan area
- Tri-Cities, Illinois
- Tri-Cities, Nebraska
- Tri-Cities, Virginia
- Tri-Cities, Washington
- Tri-City Americans
- Tri-City Chili Peppers
- Tri-City Dust Devils
- Tri-City News
- Tri-City ValleyCats
- Tri-City, Oregon
- Tri-Valley
- Triangle Region (Denmark)
- Tricity, Nepal
- Tricity, Poland
- Triple Cities
- Tripoli (disambiguation)
- Trollhättan
- Tuttle, Oklahoma
- Twin cities
- Twin city (disambiguation)
- Uddevalla
- Udupi
- Union City, California
- Vista, California
- Vänersborg
- Warangal Tri-City
- West Yorkshire Urban Area
- Yamaha Tricity