Norco is a census-designated place in St. Charles Parish, Louisiana, United States. The population was 3,579 at the 2000 census. The community is home to a major Shell refinery; its name is derived from the New Orleans Refining Company. Norco apartments for rent comparison page shows most up to date rent information on Norco apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.