Lafayette, Vermilionville, or the Lafayette metropolitan statistical area per the U.S. Office of Management and Budget, is the third largest metropolitan statistical area in the U.S. state of Louisiana. Located in the south central Acadiana region, it covers five parishes. At the 2020 U.S. census, 478,384 people lived in the metropolitan area, making it the 116th most populous in the United States and one of Louisiana's fastest growing metropolises; in 2010, its population was 273,738 and it outpaced the Shreveport–Bossier City metropolitan area in 2015.

Acadia Parish is a parish located in the U.S. state of Louisiana. At the 2020 U.S. census, the population was 57,576. The parish seat is Crowley. The parish was founded from parts of St. Landry Parish in 1886, and later an election was held to determine the parish seat, ending when Crowley beat Rayne and Prairie Hayes. Acadia Parish is included in the Lafayette metropolitan statistical area.