Marion is a city and the county seat of Crittenden County, Arkansas, United States. The population was 12,345 at the 2010 census, a 38.7% increase over the decade 2000-2010. The city is part of the Memphis metropolitan area. It is the second largest city in Crittenden County, behind West Memphis. Marion is located at 35°12′22″N 90°12′6″W / 35.20611°N 90.20167°W / 35.20611; -90.20167 (35.206092, -90.201734).