Using 3321 on entry documents
Port code 3321 identifies Whitlash, MT as the port of entry on CBP Form 7501, the entry summary a broker files for every formal entry. The same four digits identify the port in ACE entry filings, in AMS manifest data and in the Importer Security Filing (ISF), which must be on file before ocean cargo loads for the United States.
The first two digits are the customs district: 3321 belongs to Great Falls, MT (district 33), and every port of entry in that district starts with the same two digits.
The code is for customs, not carriers. Carriers, forwarders and NVOCCs book and manifest against the UN/LOCODE for the place, and the bill of lading shows that five-character code, not the Schedule D code. Many Schedule D ports of entry — airports, land border crossings, user-fee airports and inland ports — have no UN/LOCODE seaport entry at all, and this site does not hold a UN/LOCODE page for Whitlash, MT; the UN/LOCODE finder searches the full code list.
CBP adds and retires codes as ports of entry open, merge or close, so confirm 3321 against the current CBP publication before filing. Airlift USA does not hold a U.S. customs broker license; entries on cargo we move are filed through our licensed broker network.