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That's what Google is for:

THE PORT OF HOUSTON:
A total of 6,539 vessel calls were recorded at the Port of Houston during the year 2004, and approximately 200 million tons of cargo moved through the Port in 2004. ========================================================

THE PORTS OF NEW ORLEANS AND SOUTH LOUISIANA:

The "Port of New Orleans", is actually a vast complex of port facilities, with the Port of New Orleans running south of the city, downriver, and the Port of South Louisiana [POSL] running north of the city, upriver, for 54-miles [from Milepost 114 to Milepost 168 along the Mississippi. The POSL is the largest tonnage port district in the western hemisphere, shipping, among other things, 60 percent of the world’s grain

The Port of New Orleans handles about 84 million short tons of cargo a year.

About 5,000 ships from nearly 60 nations dock at the Port of New Orleans annually. The chief exports are grain and other foods from the Midwestern United States and petroleum products. The leading imports include chemicals, cocoa beans, coffee, and petroleum. The port handles more trade with Latin America than does any other U.S. gateway, including Miami.

New Orleans is also a busy port for barges. The barges use the nation's two main inland waterways, the Mississippi River and the Gulf Intracoastal Waterway, which meet at New Orleans. The port of New Orleans handles about 50,000 barges yearly.

The Port of South Louisiana, which stretches 54 miles along the Mississippi River, is the largest tonnage port district (comprised of facilities in St. Charles, St. John the Baptist, and St. James Parishes) in the Western Hemisphere and ranks fourth in the world. It handled over 248 million tons of cargo in 2004 brought to its terminals by vessel, barge, rail, and truck.

Over 50,000 barges and 4,000 ocean-going vessels call at the port each year, making it the top ranked in the country for export tonnage and total tonnage.

The two ports, combined, would be the 4th largest port in the world.