The State of Louisiana is located in the southern part of the United States, near the Gulf of Mexico. The state has a land area of 125,000 square kilometers and a population of about 4.2 million. The state capital is Baton Rouge. The largest city is New Orleans. Louisiana is rich in mineral resources, including oil and natural gas. Agriculture and manufacturing are relatively developed. The state is close to the Gulf of Mexico, so shipping is developed and there are many ports. The main ports are South Louisiana Port, New Orleans Port, Baton Rouge Port and Charles Port. Airport and aviation are also very convenient. However, it is still dominated by water transportation, followed by railways and highways. The main airports are: New Orleans International Airport. Louisiana's zip abbreviation code is: LA and the area code is 225 - 318 - 337 - 504 - 985. The main city of New Orleans has a zip code of 70112-70195.