A metroplex is a contiguous metropolitan area that has more than one principal anchor city of near equal importance.
It is this "near equal" importance that makes cities such as Tokyo, Mexico City, New York City, Los Angeles, Houston, Chicago, and Phoenix not metroplexes, though they do have secondary anchor cities in their metropolitan areas.
- The Ruhr area, consisting of Dortmund, Essen, Duisburg, Bochum, Gelsenkirchen, Oberhausen and other cities
- The Silesian Metropolis (in fact a metroplex despite being erroneously translated from Polish as a metropolis)
United Arab Emirates
- Leeds-Bradford, also known as the West Yorkshire Urban Area
- Southampton-Portsmouth, also known as the South Hampshire metropolitan area
- Bournemouth-Poole, also known as the South East Dorset Conurbation
In the United States, the term "Metroplex" is most often used to refer to the Dallas–Fort Worth area. Other areas in the U.S. that may locally be called a "metroplex" are:
- Baltimore-Washington, Maryland/District of Columbia
- Raleigh-Durham-Chapel Hill, North Carolina, more often called "The Triangle"
- Gulfport-Biloxi, Mississippi
- Minneapolis-Saint Paul, Minnesota, more often called the "Twin Cities"
- San Bernardino-Riverside, California, more often called the Inland Empire or the Twin Cities of the West.
- San Jose-Oakland-San Francisco, California, more often called the "Bay Area"
- Tampa-St. Petersburg, Florida, referred to together as Tampa Bay
- Winston-Salem–Greensboro–High Point, North Carolina, more often called the "Piedmont Triad"
- Huntsville–Athens–Decatur–Florence, Alabama, more often called the "Tennessee Valley" area or "The Shoals" referring to nearby Muscle Shoals, Alabama.
- Virginia Beach-Norfolk-Newport News, VA-NC more often called "Hampton Roads" and also known as the Tidewater Region.
- Daytonnati, a convergence of the urban areas of both Dayton and greater Cincinnati
- Dallas-Fort Worth, Texas, referred to as "DFW" as in "DFW Airport" that is located right in the middle.