Sterlington is a town in northern Ouachita Parish, Louisiana, United States, near the boundary with Union Parish. At the 2010 census, the population was 1,594. In the 2018 census estimates, the population rose to 2,724. In 2014, Sterlington was the fastest-growing community in Northeast Louisiana.

Ouachita Parish is located in the northern part of the U.S. state of Louisiana. As of the 2020 census, the population was 160,368. The parish seat is Monroe. The parish was formed in 1807.