New Orleans is a major United States port and the largest city located in the U.S. state of Louisiana. It is within Orleans County and derived its name from Philippe II, Duke of Orléans. It has a total area of 169.42 square miles at 29.95°N 90.08°W. The elevation is -6.5 to 20 feet above sea level. As of the 2010 census data, it had a total population of 343,829.