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A united city is one which, as a consequence of political changes or border shifts, once constituted two separate entities that were later merged. (See also Divided cities)
- Beirut united in 1990
- Berlin united in 1990
- Budapest united in 1873
- Jerusalem, united in 1967 under Israeli rule; all parts claimed by Israel
- western Jerusalem - 1948–1967 under Israeli rule
- East Jerusalem (al Quds) - 1948–1967 under Jordanian rule
- Golub-Dobrzyń united in 1951 12,500 inhabitants
- Colona, Illinois
- Helena-West Helena, Arkansas in the United States united in 2006
- Zagreb united in 1851.
The Canadian city of Lloydminster, although divided by a provincial border, can be considered a "united city" as it is administered as a single city through a special joint agreement between the provinces of Alberta and Saskatchewan. Similarly, the city of Flin Flon, which straddles the Manitoba-Saskatchewan border, is also administered as a single city by a similar joint agreement.