Largest city in the Ain department: the 2026 ranking
The 391 towns of the Ain department (01) ranked by population, area and density, based on the official INSEE population figures in force in 2026.
The largest city in the Ain department is Bourg-en-Bresse, with 43,961 inhabitants (ranked 174th in France by population). The largest town by area is Haut Valromey (122 km²). The most densely populated is Saint-Laurent-sur-Saône, with 3,443 inhabitants per km². At the other end of the ranking, Armix has only 28 inhabitants.
The Ain department has 694,945 inhabitants over 5,762 km², a density of 121 inhabitants per km², close to the national average (110 per km²). It accounts for 8.3% of the population of Auvergne-Rhône-Alpes, the region it has belonged to since the 2016 reform (formerly Rhône-Alpes): see the ranking of the largest cities in Auvergne-Rhône-Alpes.
The 20 largest cities in the Ain department by population
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Bourg-en-Bresse | 43,961 | 24 | 1,842 | 174th |
| 2 | Oyonnax | 22,923 | 36 | 634 | 406th |
| 3 | Valserhône | 17,031 | 63 | 272 | 584th |
| 4 | Ambérieu-en-Bugey | 16,339 | 25 | 664 | 608th |
| 5 | Saint-Genis-Pouilly | 14,673 | 9.8 | 1,502 | 688th |
| 6 | Gex | 13,912 | 32 | 434 | 727th |
| 7 | Ferney-Voltaire | 12,235 | 4.8 | 2,560 | 828th |
| 8 | Divonne-les-Bains | 10,683 | 34 | 315 | 973rd |
| 9 | Miribel | 10,520 | 24 | 430 | 999th |
| 10 | Belley | 9,695 | 22 | 432 | 1,098th |
| 11 | Prévessin-Moëns | 9,412 | 12 | 780 | 1,139th |
| 12 | Meximieux | 8,388 | 14 | 610 | 1,297th |
| 13 | Lagnieu | 7,524 | 27 | 276 | 1,458th |
| 14 | Viriat | 7,235 | 45 | 161 | 1,524th |
| 15 | Trévoux | 7,181 | 5.7 | 1,258 | 1,535th |
| 16 | Montluel | 7,083 | 40 | 177 | 1,554th |
| 17 | Thoiry | 6,726 | 29 | 232 | 1,646th |
| 18 | Péronnas | 6,690 | 18 | 381 | 1,661st |
| 19 | Jassans-Riottier | 6,342 | 4.8 | 1,319 | 1,772nd |
| 20 | Saint-Denis-lès-Bourg | 6,313 | 13 | 502 | 1,780th |
Largest towns by area in the Ain department
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Haut Valromey | 821 | 122 | 7 | 149th |
| 2 | Plateau d'Hauteville | 5,012 | 106 | 47 | 205th |
| 3 | Valserhône | 17,031 | 63 | 272 | 712th |
| 4 | Bâgé-Dommartin | 4,140 | 57 | 73 | 871st |
| 5 | Valromey-sur-Séran | 1,376 | 57 | 24 | 880th |
| 6 | Chézery-Forens | 445 | 47 | 10 | 1,424th |
| 7 | Val-Revermont | 2,539 | 45 | 56 | 1,516th |
| 8 | Viriat | 7,235 | 45 | 161 | 1,548th |
| 9 | Saint-Trivier-sur-Moignans | 1,999 | 42 | 48 | 1,822nd |
| 10 | Arvière-en-Valromey | 732 | 41 | 18 | 1,952nd |
Most densely populated towns in the Ain department
| # | Town | Population | km² | per km² | France rank |
|---|---|---|---|---|---|
| 1 | Saint-Laurent-sur-Saône | 1,825 | 0.5 | 3,443 | 241st |
| 2 | Ferney-Voltaire | 12,235 | 4.8 | 2,560 | 353rd |
| 3 | Bourg-en-Bresse | 43,961 | 24 | 1,842 | 494th |
| 4 | Saint-Genis-Pouilly | 14,673 | 9.8 | 1,502 | 622nd |
| 5 | Jassans-Riottier | 6,342 | 4.8 | 1,319 | 714th |
| 6 | Trévoux | 7,181 | 5.7 | 1,258 | 763rd |
| 7 | Thoissey | 1,634 | 1.3 | 1,219 | 785th |
| 8 | Bâgé-le-Châtel | 1,032 | 0.9 | 1,173 | 815th |
| 9 | Beauregard | 883 | 0.9 | 939 | 1,001st |
| 10 | Massieux | 2,907 | 3.1 | 938 | 1,004th |
All towns in the Ain department (391)
INSEE total population in parentheses. Each town page gives its area, density, national and departmental rankings, and neighboring towns.
- Ambérieu-en-Bugey (16,339)
- Ambérieux-en-Dombes (1,930)
- Ambléon (115)
- Ambronay (2,956)
- Ambutrix (776)
- Andert-et-Condon (356)
- Anglefort (1,197)
- Apremont (426)
- Aranc (344)
- Arandas (140)
- Arbent (3,635)
- Arbigny (470)
- Arboys en Bugey (720)
- Argis (427)
- Armix (28)
- Ars-sur-Formans (1,557)
- Artemare (1,152)
- Arvière-en-Valromey (732)
- Asnières-sur-Saône (79)
- Attignat (3,476)
- Bâgé-Dommartin (4,140)
- Bâgé-le-Châtel (1,032)
- Balan (3,159)
- Baneins (638)
- Béard-Géovreissiat (1,085)
- Beaupont (745)
- Beauregard (883)
- Béligneux (3,578)
- Belley (9,695)
- Belleydoux (314)
- Bellignat (3,796)
- Bénonces (314)
- Bény (794)
- Béréziat (486)
- Bettant (785)
- Bey (293)
- Beynost (5,289)
- Billiat (730)
- Birieux (282)
- Biziat (901)
- Blyes (1,438)
- Bohas-Meyriat-Rignat (963)
- Boissey (399)
- Bolozon (103)
- Bouligneux (324)
- Bourg-en-Bresse (43,961)
- Bourg-Saint-Christophe (1,602)
- Boyeux-Saint-Jérôme (375)
- Boz (530)
- Brégnier-Cordon (823)
- Brénod (587)
- Brens (1,157)
- Bresse Vallons (2,427)
- Bressolles (1,051)
- Brion (608)
- Briord (1,139)
- Buellas (1,946)
- Ceignes (265)
- Cerdon (762)
- Certines (1,570)
- Cessy (5,945)
- Ceyzériat (3,412)
- Ceyzérieu (1,085)
- Chalamont (2,570)
- Chaleins (1,538)
- Chaley (130)
- Challes-la-Montagne (185)
- Challex (1,668)
- Champagne-en-Valromey (851)
- Champdor-Corcelles (680)
- Champfromier (741)
- Chanay (587)
- Chaneins (1,065)
- Chanoz-Châtenay (1,008)
- Charix (288)
- Charnoz-sur-Ain (974)
- Château-Gaillard (2,484)
- Châtenay (383)
- Châtillon-la-Palud (1,768)
- Châtillon-sur-Chalaronne (5,462)
- Chavannes-sur-Reyssouze (745)
- Chaveyriat (1,096)
- Chazey-Bons (1,162)
- Chazey-sur-Ain (1,692)
- Cheignieu-la-Balme (134)
- Chevillard (157)
- Chevroux (1,009)
- Chevry (2,425)
- Chézery-Forens (445)
- Civrieux (2,074)
- Cize (175)
- Cleyzieu (145)
- Coligny (1,375)
- Collonges (2,445)
- Colomieu (159)
- Conand (137)
- Condamine (486)
- Condeissiat (857)
- Confort (679)
- Confrançon (1,387)
- Contrevoz (508)
- Conzieu (160)
- Corbonod (1,346)
- Corlier (117)
- Cormoranche-sur-Saône (1,210)
- Cormoz (708)
- Corveissiat (618)
- Courmangoux (536)
- Courtes (293)
- Crans (331)
- Cressin-Rochefort (385)
- Crottet (1,890)
- Crozet (2,461)
- Cruzilles-lès-Mépillat (1,006)
- Culoz-Béon (3,507)
- Curciat-Dongalon (484)
- Curtafond (843)
- Cuzieu (430)
- Dagneux (4,826)
- Divonne-les-Bains (10,683)
- Dompierre-sur-Chalaronne (459)
- Dompierre-sur-Veyle (1,266)
- Domsure (560)
- Dortan (2,115)
- Douvres (1,132)
- Drom (219)
- Druillat (1,159)
- Échallon (810)
- Échenevex (2,390)
- Évosges (147)
- Faramans (944)
- Fareins (2,592)
- Farges (1,101)
- Feillens (3,482)
- Ferney-Voltaire (12,235)
- Flaxieu (73)
- Foissiat (2,066)
- Francheleins (1,632)
- Frans (2,619)
- Garnerans (723)
- Genouilleux (723)
- Géovreisset (873)
- Gex (13,912)
- Giron (177)
- Gorrevod (842)
- Grand-Corent (188)
- Grièges (1,953)
- Grilly (910)
- Groissiat (1,260)
- Groslée-Saint-Benoit (1,250)
- Guéreins (1,540)
- Haut Valromey (821)
- Hautecourt-Romanèche (776)
- Illiat (723)
- Injoux-Génissiat (1,142)
- Innimond (96)
- Izenave (168)
- Izernore (2,354)
- Izieu (233)
- Jassans-Riottier (6,342)
- Jasseron (1,958)
- Jayat (1,283)
- Journans (395)
- Joyeux (265)
- Jujurieux (2,296)
- L'Abergement-Clémenciat (876)
- L'Abergement-de-Varey (276)
- La Boisse (3,528)
- La Burbanche (101)
- La Chapelle-du-Châtelard (394)
- La Tranclière (296)
- Labalme (210)
- Lagnieu (7,524)
- Laiz (1,317)
- Lantenay (271)
- Lapeyrouse (353)
- Lavours (139)
- Le Montellier (342)
- Le Plantay (567)
- Le Poizat-Lalleyriat (751)
- Léaz (926)
- Lélex (245)
- Lent (1,547)
- Les Neyrolles (642)
- Lescheroux (734)
- Leyment (1,473)
- Leyssard (169)
- Lhuis (906)
- Lompnas (173)
- Loyettes (3,592)
- Lurcy (422)
- Magnieu (663)
- Maillat (686)
- Malafretaz (1,285)
- Mantenay-Montlin (339)
- Manziat (2,060)
- Marboz (2,307)
- Marchamp (141)
- Marignieu (164)
- Marlieux (1,268)
- Marsonnas (1,059)
- Martignat (1,704)
- Massieux (2,907)
- Massignieu-de-Rives (659)
- Matafelon-Granges (641)
- Meillonnas (1,472)
- Mérignat (131)
- Messimy-sur-Saône (1,381)
- Meximieux (8,388)
- Mézériat (2,209)
- Mijoux (312)
- Mionnay (2,350)
- Miribel (10,520)
- Misérieux (2,284)
- Mogneneins (867)
- Montagnat (2,232)
- Montagnieu (686)
- Montanges (379)
- Montceaux (1,219)
- Montcet (726)
- Monthieux (674)
- Montluel (7,083)
- Montmerle-sur-Saône (3,888)
- Montracol (1,056)
- Montréal-la-Cluse (3,655)
- Montrevel-en-Bresse (2,790)
- Murs-et-Gélignieux (243)
- Nantua (3,586)
- Neuville-les-Dames (1,584)
- Neuville-sur-Ain (1,819)
- Neyron (2,460)
- Niévroz (1,682)
- Nivigne et Suran (838)
- Nivollet-Montgriffon (123)
- Nurieux-Volognat (994)
- Oncieu (73)
- Ordonnaz (154)
- Ornex (5,191)
- Outriaz (266)
- Oyonnax (22,923)
- Ozan (746)
- Parcieux (1,346)
- Parves et Nattages (988)
- Péron (2,977)
- Péronnas (6,690)
- Pérouges (1,419)
- Perrex (890)
- Peyriat (157)
- Peyrieu (959)
- Peyzieux-sur-Saône (664)
- Pirajoux (407)
- Pizay (951)
- Plagne (166)
- Plateau d'Hauteville (5,012)
- Polliat (2,790)
- Pollieu (171)
- Poncin (1,828)
- Pont-d'Ain (2,893)
- Pont-de-Vaux (2,244)
- Pont-de-Veyle (1,683)
- Port (858)
- Pougny (885)
- Pouillat (80)
- Prémeyzel (246)
- Prémillieu (50)
- Prévessin-Moëns (9,412)
- Priay (1,865)
- Ramasse (342)
- Rancé (790)
- Relevant (474)
- Replonges (4,038)
- Revonnas (948)
- Reyrieux (5,466)
- Reyssouze (1,014)
- Rignieux-le-Franc (1,200)
- Romans (644)
- Rossillon (167)
- Saint-Alban (196)
- Saint-André-d'Huiriat (682)
- Saint-André-de-Bâgé (859)
- Saint-André-de-Corcy (3,415)
- Saint-André-le-Bouchoux (421)
- Saint-André-sur-Vieux-Jonc (1,255)
- Saint-Bénigne (1,388)
- Saint-Bernard (1,619)
- Saint-Cyr-sur-Menthon (1,921)
- Saint-Denis-en-Bugey (2,275)
- Saint-Denis-lès-Bourg (6,313)
- Saint-Didier-d'Aussiat (862)
- Saint-Didier-de-Formans (2,270)
- Saint-Didier-sur-Chalaronne (2,992)
- Saint-Éloi (538)
- Saint-Étienne-du-Bois (2,634)
- Saint-Étienne-sur-Chalaronne (1,664)
- Saint-Étienne-sur-Reyssouze (584)
- Saint-Genis-Pouilly (14,673)
- Saint-Genis-sur-Menthon (498)
- Saint-Georges-sur-Renon (231)
- Saint-Germain-de-Joux (513)
- Saint-Germain-les-Paroisses (430)
- Saint-Germain-sur-Renon (266)
- Saint-Jean-de-Gonville (2,134)
- Saint-Jean-de-Niost (1,920)
- Saint-Jean-de-Thurigneux (874)
- Saint-Jean-le-Vieux (1,899)
- Saint-Jean-sur-Reyssouze (774)
- Saint-Jean-sur-Veyle (1,165)
- Saint-Julien-sur-Reyssouze (688)
- Saint-Julien-sur-Veyle (877)
- Saint-Just (975)
- Saint-Laurent-sur-Saône (1,825)
- Saint-Marcel (1,361)
- Saint-Martin-de-Bavel (442)
- Saint-Martin-du-Frêne (1,054)
- Saint-Martin-du-Mont (2,055)
- Saint-Martin-le-Châtel (819)
- Saint-Maurice-de-Beynost (4,375)
- Saint-Maurice-de-Gourdans (2,975)
- Saint-Maurice-de-Rémens (769)
- Saint-Nizier-le-Bouchoux (591)
- Saint-Nizier-le-Désert (934)
- Saint-Paul-de-Varax (1,655)
- Saint-Rambert-en-Bugey (2,221)
- Saint-Rémy (934)
- Saint-Sorlin-en-Bugey (1,213)
- Saint-Sulpice (263)
- Saint-Trivier-de-Courtes (1,135)
- Saint-Trivier-sur-Moignans (1,999)
- Saint-Vulbas (1,267)
- Sainte-Croix (556)
- Sainte-Euphémie (1,796)
- Sainte-Julie (1,108)
- Sainte-Olive (360)
- Salavre (313)
- Samognat (659)
- Sandrans (596)
- Sault-Brénaz (1,035)
- Sauverny (1,052)
- Savigneux (1,490)
- Ségny (2,997)
- Seillonnaz (138)
- Sergy (2,364)
- Sermoyer (680)
- Serrières-de-Briord (1,358)
- Serrières-sur-Ain (137)
- Servas (1,313)
- Servignat (188)
- Seyssel (1,035)
- Simandre-sur-Suran (688)
- Sonthonnax-la-Montagne (304)
- Souclin (269)
- Sulignat (615)
- Surjoux-Lhopital (142)
- Talissieu (514)
- Tenay (1,037)
- Thil (1,282)
- Thoiry (6,726)
- Thoissey (1,634)
- Torcieu (754)
- Tossiat (1,453)
- Toussieux (1,271)
- Tramoyes (1,898)
- Trévoux (7,181)
- Val-Revermont (2,539)
- Valeins (134)
- Valromey-sur-Séran (1,376)
- Valserhône (17,031)
- Vandeins (746)
- Varambon (686)
- Vaux-en-Bugey (1,230)
- Verjon (352)
- Vernoux (293)
- Versailleux (504)
- Versonnex (2,245)
- Vesancy (529)
- Vescours (223)
- Vésines (97)
- Vieu-d'Izenave (736)
- Villars-les-Dombes (5,257)
- Villebois (1,234)
- Villemotier (630)
- Villeneuve (1,664)
- Villereversure (1,447)
- Villes (395)
- Villette-sur-Ain (795)
- Villieu-Loyes-Mollon (3,924)
- Viriat (7,235)
- Virieu-le-Grand (1,130)
- Virignin (1,169)
- Vongnes (77)
- Vonnas (3,299)
Other departments in Auvergne-Rhône-Alpes
Allier (03) Ardèche (07) Cantal (15) Drôme (26) Isère (38) Loire (42) Haute-Loire (43) Puy-de-Dôme (63) Rhône (69) Savoie (73) Haute-Savoie (74) 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.