CBP port code · Airport

Midamerican Airport, IL port code: 4581

The CBP port code for Midamerican Airport, IL is 4581; it is in the St Louis, MO customs district (district code 45).

Port code: 4581
District: 45
State: Illinois

Port details

About port code 4581

Port code	4581
Port of entry	Midamerican Airport, IL
As listed	MIDAMERICAN AIRPORT, IL
Customs district	St Louis, MO (45)
State	Illinois (IL)
Type	Airport
On CBP's list	Yes, ACE Appendix E (revised 3 February 2026)

Importing through Midamerican Airport, IL

Where the code goes

Where port code 4581 is used

The four-digit code identifies the port on US import paperwork. Your customs broker usually enters it, but importers and exporters see it on the documents.

CBP Form 7501

The entry summary takes Schedule D codes in the port code box (where the entry is filed) and in box 20, the U.S. port of unlading.

Carrier manifest

CBP publishes its port code list for import manifests filed in ACE. The carrier's manifest names the US port of unlading by this code.

ISF for ocean cargo

The importer, or its agent, files the Importer Security Filing at least 24 hours before the container is loaded abroad. CBP matches it to the manifest by bill of lading.

Questions

Port code 4581: FAQs

What is the port code for Midamerican Airport, IL?

The CBP port code for Midamerican Airport, IL is 4581. It is in the St Louis, MO customs district (district code 45).

Where is port code 4581 used?

On CBP Form 7501, the entry summary, four-digit Schedule D codes go in the port code box (the port where the entry is filed) 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.

Which customs district is Midamerican Airport, IL in?

The first two digits of a Schedule D code are its district, so 4581 is in the St Louis, MO customs district (district code 45). This list has 5 other ports of entry in that district.

How do I get a quote for shipping from India to Midamerican Airport?

Send Atmavaan the cargo, where it is made in India and the US delivery address. We quote the routing by sea or air, and can file the ISF for ocean cargo and arrange US customs clearance.

How current is this port code?

This page uses the Census Bureau's Schedule D district and port list (April 2025 edition), checked against CBP's ACE Appendix E port code list revised 3 February 2026. CBP opens, closes and renumbers ports from time to time, so confirm the code with your customs broker before filing.

Source: Census Bureau Schedule D district and port list (April 2025), checked against CBP's ACE Appendix E port codes (revised 3 February 2026); UN/LOCODE links from the UNECE code list. Public-domain US government data. Confirm codes with your customs broker before filing.