Colmar Wikipedia. Colmar (French: Colmar, pronounced ; Alsatian: Colmer; German during 1871–1918 and 1940–1945: Kolmar) is a city and commune in the Haut-Rhin department and Grand Est region of north-eastern France.The third-largest commune in Alsace (after Strasbourg and Mulhouse), it is the seat of the prefecture of the Haut-Rhin department and of the subprefecture of the Colmar