Largest city in the Yvelines department: the 2026 ranking
The 259 towns of the Yvelines department (78) ranked by population, area and density, based on the official INSEE population figures in force in 2026.
The largest city in the Yvelines department is Versailles, with 85,750 inhabitants (ranked 56th in France by population). The largest town by area is Saint-Germain-en-Laye (52 km²). The most densely populated is Houilles, with 7,735 inhabitants per km². At the other end of the ranking, Le Tartre-Gaudran has only 38 inhabitants.
The Yvelines department has 1,508,510 inhabitants over 2,284 km², a density of 660 inhabitants per km², 6.0 times the national average (110 per km²). It accounts for 12.0% of the population of Île-de-France, the region it belongs to: see the ranking of the largest cities in Île-de-France.
The 20 largest cities in the Yvelines department by population
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Versailles | 85,750 | 26 | 3,275 | 56th |
| 2 | Sartrouville | 53,154 | 8.5 | 6,283 | 123rd |
| 3 | Saint-Germain-en-Laye | 47,628 | 52 | 917 | 145th |
| 4 | Mantes-la-Jolie | 43,683 | 9.4 | 4,657 | 178th |
| 5 | Poissy | 41,274 | 13 | 3,108 | 194th |
| 6 | Conflans-Sainte-Honorine | 37,426 | 9.9 | 3,780 | 219th |
| 7 | Les Mureaux | 34,793 | 12 | 2,902 | 241st |
| 8 | Trappes | 34,788 | 13 | 2,583 | 242nd |
| 9 | Houilles | 34,268 | 4.4 | 7,735 | 243rd |
| 10 | Montigny-le-Bretonneux | 32,969 | 12 | 2,830 | 256th |
| 11 | Plaisir | 32,147 | 19 | 1,721 | 264th |
| 12 | Le Chesnay-Rocquencourt | 31,339 | 7.0 | 4,464 | 275th |
| 13 | Chatou | 31,112 | 5.1 | 6,124 | 278th |
| 14 | Guyancourt | 30,226 | 13 | 2,325 | 291st |
| 15 | Rambouillet | 28,364 | 35 | 806 | 312th |
| 16 | Élancourt | 26,611 | 8.5 | 3,127 | 345th |
| 17 | Maisons-Laffitte | 23,549 | 6.8 | 3,489 | 391st |
| 18 | Vélizy-Villacoublay | 23,206 | 8.9 | 2,599 | 400th |
| 19 | Mantes-la-Ville | 22,504 | 6.1 | 3,714 | 416th |
| 20 | Achères | 22,367 | 9.4 | 2,369 | 420th |
Largest towns by area in the Yvelines department
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Saint-Germain-en-Laye | 47,628 | 52 | 917 | 1,071st |
| 2 | Sonchamp | 1,738 | 46 | 37 | 1,433rd |
| 3 | Rambouillet | 28,364 | 35 | 806 | 2,781st |
| 4 | Saint-Léger-en-Yvelines | 1,500 | 35 | 43 | 2,911th |
| 5 | Prunay-en-Yvelines | 815 | 27 | 30 | 4,830th |
| 6 | Versailles | 85,750 | 26 | 3,275 | 5,085th |
| 7 | Ablis | 3,960 | 26 | 153 | 5,179th |
| 8 | Gazeran | 1,526 | 26 | 59 | 5,231st |
| 9 | La Boissière-École | 786 | 25 | 31 | 5,519th |
| 10 | Poigny-la-Forêt | 990 | 23 | 43 | 6,298th |
Most densely populated towns in the Yvelines department
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Houilles | 34,268 | 4.4 | 7,735 | 70th |
| 2 | Sartrouville | 53,154 | 8.5 | 6,283 | 96th |
| 3 | Chatou | 31,112 | 5.1 | 6,124 | 100th |
| 4 | Le Pecq | 16,333 | 2.8 | 5,751 | 108th |
| 5 | Viroflay | 17,596 | 3.5 | 5,042 | 138th |
| 6 | Mantes-la-Jolie | 43,683 | 9.4 | 4,657 | 159th |
| 7 | Voisins-le-Bretonneux | 10,924 | 2.4 | 4,590 | 160th |
| 8 | Le Chesnay-Rocquencourt | 31,339 | 7.0 | 4,464 | 168th |
| 9 | Saint-Cyr-l'École | 21,838 | 5.0 | 4,359 | 173rd |
| 10 | Le Port-Marly | 5,612 | 1.4 | 3,897 | 205th |
All towns in the Yvelines department (259)
INSEE total population in parentheses. Each town page gives its area, density, national and departmental rankings, and neighboring towns.
- Ablis (3,960)
- Achères (22,367)
- Adainville (688)
- Aigremont (1,111)
- Allainville (287)
- Andelu (565)
- Andrésy (13,983)
- Arnouville-lès-Mantes (964)
- Aubergenville (12,796)
- Auffargis (2,011)
- Auffreville-Brasseuil (685)
- Aulnay-sur-Mauldre (1,204)
- Auteuil (1,030)
- Autouillet (671)
- Bailly (3,850)
- Bazainville (1,504)
- Bazemont (1,773)
- Bazoches-sur-Guyonne (728)
- Béhoust (547)
- Bennecourt (1,772)
- Beynes (7,823)
- Blaru (933)
- Boinville-en-Mantois (290)
- Boinville-le-Gaillard (613)
- Boinvilliers (245)
- Bois-d'Arcy (16,718)
- Boissets (303)
- Boissy-Mauvoisin (632)
- Boissy-sans-Avoir (629)
- Bonnelles (2,207)
- Bonnières-sur-Seine (5,101)
- Bouafle (2,258)
- Bougival (9,267)
- Bourdonné (520)
- Breuil-Bois-Robert (780)
- Bréval (2,183)
- Brueil-en-Vexin (664)
- Buc (5,934)
- Buchelay (3,377)
- Bullion (1,956)
- Carrières-sous-Poissy (20,950)
- Carrières-sur-Seine (15,012)
- Cernay-la-Ville (1,559)
- Chambourcy (6,002)
- Chanteloup-les-Vignes (10,925)
- Chapet (1,354)
- Châteaufort (1,599)
- Chatou (31,112)
- Chaufour-lès-Bonnières (447)
- Chavenay (1,796)
- Chevreuse (5,638)
- Choisel (569)
- Civry-la-Forêt (383)
- Clairefontaine-en-Yvelines (934)
- Coignières (4,356)
- Condé-sur-Vesgre (1,307)
- Conflans-Sainte-Honorine (37,426)
- Courgent (426)
- Cravent (449)
- Crespières (1,782)
- Croissy-sur-Seine (11,210)
- Dammartin-en-Serve (1,465)
- Dampierre-en-Yvelines (1,037)
- Dannemarie (232)
- Davron (303)
- Drocourt (562)
- Ecquevilly (4,347)
- Élancourt (26,611)
- Émancé (888)
- Épône (7,093)
- Évecquemont (760)
- Favrieux (162)
- Feucherolles (3,132)
- Flacourt (185)
- Flexanville (584)
- Flins-Neuve-Église (167)
- Flins-sur-Seine (2,470)
- Follainville-Dennemont (2,201)
- Fontenay-le-Fleury (13,829)
- Fontenay-Mauvoisin (473)
- Fontenay-Saint-Père (967)
- Freneuse (4,557)
- Gaillon-sur-Montcient (703)
- Galluis (1,318)
- Gambais (2,630)
- Gambaiseuil (65)
- Garancières (2,669)
- Gargenville (7,919)
- Gazeran (1,526)
- Gommecourt (620)
- Goupillières (583)
- Goussonville (666)
- Grandchamp (311)
- Gressey (548)
- Grosrouvre (944)
- Guernes (1,103)
- Guerville (2,081)
- Guitrancourt (658)
- Guyancourt (30,226)
- Hardricourt (2,623)
- Hargeville (428)
- Herbeville (232)
- Hermeray (1,024)
- Houdan (3,772)
- Houilles (34,268)
- Issou (4,116)
- Jambville (809)
- Jouars-Pontchartrain (6,200)
- Jouy-en-Josas (8,108)
- Jouy-Mauvoisin (557)
- Jumeauville (646)
- Juziers (4,104)
- L'Étang-la-Ville (5,309)
- La Boissière-École (786)
- La Celle-les-Bordes (857)
- La Celle-Saint-Cloud (20,900)
- La Falaise (616)
- La Hauteville (163)
- La Queue-les-Yvelines (2,662)
- La Verrière (6,068)
- La Villeneuve-en-Chevrie (682)
- Lainville-en-Vexin (820)
- Le Chesnay-Rocquencourt (31,339)
- Le Mesnil-le-Roi (6,445)
- Le Mesnil-Saint-Denis (7,466)
- Le Pecq (16,333)
- Le Perray-en-Yvelines (6,575)
- Le Port-Marly (5,612)
- Le Tartre-Gaudran (38)
- Le Tertre-Saint-Denis (141)
- Le Tremblay-sur-Mauldre (1,111)
- Le Vésinet (16,010)
- Les Alluets-le-Roi (1,418)
- Les Bréviaires (1,340)
- Les Clayes-sous-Bois (17,003)
- Les Essarts-le-Roi (6,954)
- Les Loges-en-Josas (1,709)
- Les Mesnuls (927)
- Les Mureaux (34,793)
- Lévis-Saint-Nom (1,638)
- Limay (18,010)
- Limetz-Villez (2,138)
- Lommoye (648)
- Longnes (1,625)
- Longvilliers (504)
- Louveciennes (8,127)
- Magnanville (6,534)
- Magny-les-Hameaux (9,548)
- Maisons-Laffitte (23,549)
- Mantes-la-Jolie (43,683)
- Mantes-la-Ville (22,504)
- Marcq (816)
- Mareil-le-Guyon (429)
- Mareil-Marly (4,263)
- Mareil-sur-Mauldre (1,822)
- Marly-le-Roi (17,159)
- Maule (6,313)
- Maulette (1,104)
- Maurecourt (4,507)
- Maurepas (20,844)
- Médan (1,314)
- Ménerville (219)
- Méré (1,779)
- Méricourt (390)
- Meulan-en-Yvelines (9,025)
- Mézières-sur-Seine (3,957)
- Mézy-sur-Seine (2,279)
- Millemont (279)
- Milon-la-Chapelle (301)
- Mittainville (671)
- Moisson (917)
- Mondreville (388)
- Montainville (600)
- Montalet-le-Bois (327)
- Montchauvet (282)
- Montesson (14,761)
- Montfort-l'Amaury (2,845)
- Montigny-le-Bretonneux (32,969)
- Morainvilliers (3,189)
- Mousseaux-sur-Seine (701)
- Mulcent (133)
- Neauphle-le-Château (3,296)
- Neauphle-le-Vieux (958)
- Neauphlette (885)
- Nézel (1,146)
- Noisy-le-Roi (7,998)
- Notre-Dame-de-la-Mer (757)
- Oinville-sur-Montcient (1,145)
- Orcemont (1,002)
- Orgerus (2,534)
- Orgeval (7,470)
- Orphin (894)
- Orsonville (332)
- Orvilliers (942)
- Osmoy (427)
- Paray-Douaville (226)
- Perdreauville (714)
- Plaisir (32,147)
- Poigny-la-Forêt (990)
- Poissy (41,274)
- Ponthévrard (711)
- Porcheville (3,440)
- Prunay-en-Yvelines (815)
- Prunay-le-Temple (416)
- Raizeux (998)
- Rambouillet (28,364)
- Rennemoulin (120)
- Richebourg (1,617)
- Rochefort-en-Yvelines (939)
- Rolleboise (348)
- Rosay (393)
- Rosny-sur-Seine (7,410)
- Sailly (359)
- Saint-Arnoult-en-Yvelines (6,006)
- Saint-Cyr-l'École (21,838)
- Saint-Forget (448)
- Saint-Germain-de-la-Grange (1,877)
- Saint-Germain-en-Laye (47,628)
- Saint-Hilarion (1,022)
- Saint-Illiers-la-Ville (356)
- Saint-Illiers-le-Bois (454)
- Saint-Lambert (489)
- Saint-Léger-en-Yvelines (1,500)
- Saint-Martin-de-Bréthencourt (698)
- Saint-Martin-des-Champs (313)
- Saint-Martin-la-Garenne (971)
- Saint-Nom-la-Bretèche (5,164)
- Saint-Rémy-l'Honoré (1,715)
- Saint-Rémy-lès-Chevreuse (7,908)
- Sainte-Mesme (922)
- Sartrouville (53,154)
- Saulx-Marchais (967)
- Senlisse (520)
- Septeuil (2,304)
- Soindres (766)
- Sonchamp (1,738)
- Tacoignières (1,236)
- Tessancourt-sur-Aubette (977)
- Thiverval-Grignon (1,033)
- Thoiry (1,460)
- Tilly (545)
- Toussus-le-Noble (1,211)
- Trappes (34,788)
- Triel-sur-Seine (12,377)
- Vaux-sur-Seine (5,274)
- Vélizy-Villacoublay (23,206)
- Verneuil-sur-Seine (16,562)
- Vernouillet (9,872)
- Versailles (85,750)
- Vert (869)
- Vicq (399)
- Vieille-Église-en-Yvelines (664)
- Villennes-sur-Seine (6,096)
- Villepreux (12,097)
- Villette (533)
- Villiers-le-Mahieu (899)
- Villiers-Saint-Frédéric (3,502)
- Viroflay (17,596)
- Voisins-le-Bretonneux (10,924)
Other departments in Île-de-France
Paris (75) Seine-et-Marne (77) Essonne (91) Hauts-de-Seine (92) Seine-Saint-Denis (93) Val-de-Marne (94) Val-d'Oise (95) All departments
Sources: INSEE, official population figures in force on January 1, 2026 (total population); land area: IGN / Observatoire des territoires. Rankings computed across the 34,858 communes in the database.