Rapides Parish is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 130,023. The parish seat is Alexandria, which developed along the Red River of the South. Rapides is the French word for "rapids". The parish was created in 1807 after the United States acquired this territory in the Louisiana Purchase.

Alexandria is the ninth-largest city in the state of Louisiana and is the parish seat of Rapides Parish, Louisiana, United States. It lies on the south bank of the Red River in almost the exact geographic center of the state. It is the principal city of the Alexandria metropolitan area which encompasses all of Rapides and Grant parishes. Its neighboring city is Pineville. In 2010, the population was 47,723, an increase of 3 percent from the 2000 census.