A transborder agglomeration is an urban agglomeration or conurbation that extends into multiple sovereign states and/or dependent territories. It includes city-states that agglomerate with their neighbouring countries.

This list is incomplete; you can help by adding missing items. (August 2010)

Main municipalities	Countries	Total population
Kinshasa–Brazzaville	Democratic Republic of the Congo / Republic of the Congo	19,547,463
Bukavu–Cyangugu	Democratic Republic of the Congo / Rwanda	1,200,000[1][2]
Goma–Gisenyi		756,323
Abidjan–Lagos	Côte d'Ivoire / Ghana / Togo / Benin / Nigeria	27,000,000
Lomé–Aflao	Togo / Ghana	1,544,206
N'Djamena–Kousséri	Chad / Cameroon	1,694,819

Main municipalities	Countries	Total population
Astara and Astara	Iran– Azerbaijan	100,000
Khorramshahr–Abadan–Basra	Iran– Iraq	2,000,000
Dhahran–Jubail–Manama	Saudi Arabia– Bahrain	2,000,000
Tashkent–Saryagash	Uzbekistan– Kazakhstan	3,000,000[3]
Fergana and Kyzyl-Kiya	Uzbekistan– Kyrgyzstan	300,000
Qorasuv and Kara-Suu		40,000
Heihe–Blagoveshchensk	China– Russia	400,000
Dandong–Sinuiju	China– North Korea	1,000,000
Greater Bay Area (Guangzhou–Dongguan–Shenzhen–Hong Kong–Macau	China– Hong Kong– Macau	71,200,000
Sijori Growth Triangle (Singapore–Johor Bahru–Batam–Bintan)	Singapore– Malaysia– Indonesia	9,000,000
Padang Besar and Padang Besar	Malaysia– Thailand	20,000
Vientiane–Nong Khai	Laos– Thailand	900,000
Al Ain and Al-Buraimi	United Arab Emirates– Oman	968,589
Savannakhet–Mukdahan	Laos– Thailand	200,000

Main municipalities	Countries	Total population[citation needed]
Øresund Region (Greater Copenhagen and Malmö)	Denmark– Sweden	3,964,522
Haparanda–Tornio	Sweden– Finland	32,000
Pello (Pello, Övertorneå and Pello, Finland)		4,500
Karesuando–Karesuvanto		500
Imatra and Svetogorsk	Finland– Russia	45,000
Ivangorod–Narva	Russia– Estonia	69,000
Valga–Valka	Estonia– Latvia	20,000
Como–Chiasso (part of Greater Milan)[4]	Italy–  Switzerland	189,000[5]
Gorizia–Nova Gorica	Italy– Slovenia
Basel–Huningue–Weil am Rhein (Trinational Eurodistrict of Basel)	Switzerland– France– Germany	2,400,000
Geneva–Annemasse–Ferney-Voltaire–Nyon (Grand Genève)	Switzerland– France	890,000
Kreuzlingen–Konstanz	Switzerland– Germany	110,000
Basque Eurocity Bayonne-San Sebastián	France– Spain	620,000
Le Perthus–Els Límits		700
Bourg-Madame–Puigcerdà
Hendaye–Irun
Lille–Roubaix–Tourcoing–Mouscron–Tournai–Kortrijk (Eurometropolis Lille–Kortrijk–Tournai)	France– Belgium	1,850,000
Longwy–Aubange–Pétange	France– Belgium– Luxembourg	80,000
Strasbourg–Kehl (Strasbourg-Ortenau Eurodistrict)	France– Germany	700,000
Forbach–Saarbrücken		700,000
Monaco–Beausoleil–Cap-d'Ail	Monaco– France	55,344
La Línea de la Concepción–Gibraltar	Spain– Gibraltar	95,628
Baarle (Baarle-Hertog–Baarle-Nassau)	Belgium– Netherlands	9,262
Görlitz–Zgorzelec	Germany– Poland	85,000
Guben–Gubin		35,000
Frankfurt (Oder)–Słubice		75,000
Szczecin		763,321
Cieszyn–Český Těšín	Poland– Czech Republic	57,000
Herzogenrath–Kerkrade	Germany– Netherlands	95,000
Freilassing–Salzburg	Germany– Austria	175,000
Vienna–Bratislava	Austria– Slovakia	2,400,000
Komárom–Komárno	Hungary– Slovakia	56,000
Rousse–Giurgiu	Bulgaria– Romania	250,000
Lifford–Strabane	Ireland– United Kingdom	18,500
Brod–Slavonski Brod	Bosnia and Herzegovina– Croatia	110,000
Zvornik–Mali Zvornik	Bosnia and Herzegovina– Serbia	70,000
Gradiška–Stara Gradiška	Bosnia and Herzegovina– Croatia	53,000
Novi Grad–Dvor	Bosnia and Herzegovina– Croatia	30,000
Dubica–Hrvatska Dubica	Bosnia and Herzegovina– Croatia	23,000
Kostajnica–Hrvatska Kostajnica	Bosnia and Herzegovina– Croatia	8,000

Main municipalities	Countries	Total population
Paso Canoas	Costa Rica / Panama	9,543
Metro Vancouver–Fraser Valley–Bellingham-Whatcom County	United States / Canada	3,350,000
Detroit–Windsor		5,976,595
Buffalo-Niagara Region		1,614,790
Port Huron–Sarnia–Point Edward		105,776
Sault Ste. Marie–Sault Ste. Marie		93,944
San Diego–Tijuana	United States / Mexico	5,105,769[6]
Calexico–Mexicali		1,143,000
San Luis Río Colorado–San Luis		227,000
Nogales–Nogales		240,000
El Paso–Juárez		2,500,000[7]
Laredo–Nuevo Laredo		775,481[8]
Lower Rio Grande Valley		2,671,028[9]
Reynosa–McAllen		1,500,000[10]
Brownsville–Matamoros		1,387,985[11]

Main municipalities	Countries	Total population
Saint-Laurent-du-Maroni–Albina	French Guiana / Suriname
Saint Georges–Oiapoque	French Guiana / Brazil	32,000
Quaraí–Artigas	Brazil / Uruguay	67,000
Santana do Livramento–Rivera		140,000
Chuí–Chuy		15,592[12][13]
Corumbá–Puerto Suárez	Brazil / Bolivia	124,000
Tabatinga–Leticia–Santa Rosa	Brazil / Colombia / Peru	107,000
Ponta Porã–Pedro Juan Caballero	Brazil / Paraguay	209,000
Foz do Iguaçu–Ciudad del Este–Puerto Iguazu	Brazil / Paraguay / Argentina	800,000
Barracão–Dionísio Cerqueira–Bernardo de Irigoyen	Brazil / Argentina	36,000
Uruguaiana–Paso de los Libres		170,000
Tulcán–Ipiales	Ecuador /  Colombia	190,000
Cúcuta–San Antonio del Táchira	Colombia / Venezuela	700,000 [14]

• Border town
• Cross-border town naming
• List of divided cities
• Metropolitan area