St. Landry Parish was established by legislative act in 1805. It is believed that Opelousas is the third oldest town in Louisiana. The agriculture lands of St. Landry Parish may be divided into three separate classes: Loessial terrace, coastal prairie and alluvial. St. Landry Parish is the most diversified parish in the state; every major crop grown in the state is grown here. St. Landry has long been one of the leading agricultural parishes in the state, and numerous residents of the urban areas receive their income from this source.