LOUIN, MS. Louin is located in northeast Jasper County, Mississippi seven miles north of Bay Springs on State Highway 15. The town has a total area of 6.1 square miles and has an elevation of 378 feet. The population of Louin at the time of the 2000 census was 339. Louin was incorpoated July 29, 1904. Louin, Mississippi, in Jasper county, is 56 miles E of Jackson, Mississippi (center to center) and 154 miles N of New Orleans, Louisiana.