US port codes: CBP ports of entry by customs district

A US port code is the four-digit Schedule D number U.S. Customs and Border Protection (CBP) uses for each port of entry. The first two digits are the customs district: 2704 is Los Angeles in district 27, and 5301 is Houston in district 53.

On CBP Form 7501, the entry summary, in the port code box and in box 20, the U.S. port of unlading. Carriers use the same codes for the port of unlading on their import manifests. Your customs broker normally fills these in.

A Schedule D code (for example 5301) is a US customs identifier used on entry documents. A UN/LOCODE (for example USHOU) is the five-character international location code carriers use on bookings and bills of lading. Each has its own job; one does not replace the other.