Sister cities of Columbia, Maryland

Columbia is a planned community comprising 10 self-contained villages, located in Howard County, Maryland, United States. It began with the idea that a city could enhance its residents' quality of life. Creator and developer James W. Rouse saw the new community in terms of human values, rather than merely economics and engineering. Opened in 1967, Columbia was intended to not only eliminate the inconveniences of then-current subdivision design, but also eliminate racial, religious, and class segregation.

Columbia proper consists only of that territory governed by the Columbia Association, but larger areas are included under its name by the U.S. Postal Service and the census. These include several other communities which predate Columbia, including Simpsonville, Atholton, and in the case of the census, Clarksville. The census-designated place had a population of 99,615 in 2010, making it the most populous community in Maryland after Baltimore.