This is a list of capital cities of sovereign states that share a border with another sovereign state.
| City | Country | Neighboring country | Neighboring city or subdivision | Notes |
|---|---|---|---|---|
| Andorra la Vella |  Andorra |  Spain | Les Valls de Valira | Microstate. The microstate as a whole borders several municipalities in the Spanish region of Catalonia and communes in the department of Ariège in France. |
| Asunción |  Paraguay |  Argentina | Clorinda | The border runs through the Paraguay River. There is no bridge across the river between the cities; all direct cross-border traffic must travel by ferry. However, travel by road is possible by a circuitous route from the border crossing between Clorinda and José Falcón to Paraguayan Route 9. |
| Bangui |  Central African Republic | Zongo | The border runs through the River Congo. There is no bridge across the Congo between the cities; all cross-border traffic must travel by ferry. | |
| Gaborone |  Botswana |  South Africa | North West Province | The border is connected by the Gaborone Dam with South Africa, running along the Notwane River. |
| Bratislava |  Slovakia |  Austria  Hungary | Burgenland (state) Győr-Moson-Sopron (county) | One of two capitals to border two sovereign states.[1] The border runs partly through the Danube, but swings west to include lands on the right bank of the river in Bratislava. The area the border runs through is rural. There are multiple rail and road links to both Austria and Hungary. |
| Brazzaville | Kinshasa | Kinshasa is also the capital of the Democratic Republic of the Congo. The cities are separated by the River Congo. There are no bridges between the twin capitals; all traffic must travel by ferry. A proposal to build a Brazzaville–Kinshasa Bridge received funding in 2018.[2] | ||
| Kinshasa | Brazzaville | Brazzaville is also the capital of the Republic of the Congo. The cities are separated by the River Congo. There are no bridges between the twin capitals; all traffic must travel by ferry. A proposal to build a Brazzaville–Kinshasa Bridge received funding in 2018. | ||
| Lomé |  Togo |  Ghana | Aflao | The cities are connected by road. |
| Maseru |  Lesotho | South Africa | Mantsopa Local Municipality | The border runs through the Caledon River. The South African side of the border is rural. There are road and rail links across the border. |
| Monaco |  Monaco |  France | Alpes-Maritimes (department) | Microstate and city-state. The state is surrounded on three sides by various communes of the French department of Alpes-Maritimes (in Provence-Alpes-Côte d'Azur). |
| N'Djamena |  Chad |  Cameroon | Kousséri | The border runs through the Chari River. The cities are connected by a bridge. |
| Rome |  Italy | Vatican City | Entirely surrounds the microstate and city-state of Vatican City. | |
| San Marino |  San Marino | Italy | Rimini (province) | Microstate. The microstate as a whole borders several municipalities (frazione) in the Italian provinces of Rimini (in Emilia-Romagna) and Pesaro and Urbino (in Marche). |
| Singapore |  Singapore |  Malaysia Indonesia | Iskandar Malaysia (urban agglomeration) Riau Archipelago (urban agglomeration) | City-state and one of two capitals to border two sovereign states. The border with Malaysia runs through the Straits of Johor. There are multiple rail and road links across the straits. A rapid transit link is planned. Singapore also shares maritime border with Indonesia which runs through Straits of Singapore, served by regularly scheduled ferries. |
| Vaduz |  Liechtenstein |  Switzerland | Sevelen | Microstate. |
| Vatican City | Italy | Rome | Microstate and city-state. Entirely surrounded by the City of Rome. | |
| Vientiane |  Thailand | Nong Khai | The border runs through the Mekong River. Nong Khai borders the Vientiane Prefecture but not the historic center of the city. The cities are connected by the First Thai–Lao Friendship Bridge. | |