US port of exit · Land border crossing

3801Detroit, Michigan US port of exit

3801 is the US code for the port of Detroit, Michigan. A Canadian declaration uses it when goods left the United States through Detroit. Across the border is CBSA office 0453, Windsor - Ambassador Bridge, and CBSA office 0452, Windsor Tunnel.

Port code: 3801
Port: Detroit
State: Michigan
CBP district: Detroit, MI
Kind: Land border crossing
Across the border: 0453 Windsor - Ambassador Bridge0452 Windsor Tunnel
Crossing: Windsor–Detroit

Map showing US port 3801, Detroit, Michigan — 3801 and the CBSA offices near it. Select a dot for its code. Each office sits at its town and each US port at its city, not at a street address. Map data: Natural Earth.

Windsor–Detroit both codes

Windsor–Detroit
0453 Windsor - Ambassador Bridge0452 Windsor Tunnel
3801 Detroit, Michigan

Other US ports in Michigan

Good to know

3801
Also a US port code. 3801 is also the US port of exit code for Detroit, Michigan. Warehouse and US port codes go on different lines of a declaration.
US port of exit
Which US port. CBSA defines it as the US port where the truck or train crosses into Canada, or the one nearest to where it crosses. For goods sent by ship or plane, it is the US port where they were loaded.
1001
Courier shipments. Low-value courier shipments name 1001, New York, as the US port of exit.
New · July 27, 2026
Gordie Howe International Bridge. CBSA added an export office for the new Windsor–Detroit bridge. Its code will appear here once it is on CBSA’s published list.

Questions

What is US port code 3801?

The code for the port of Detroit, Michigan. On a Canadian declaration, it says the goods left the United States through it.

Which CBSA office is across from 3801?

0453, Windsor - Ambassador Bridge; and 0452, Windsor Tunnel.

Sources: Ports of entry, U.S. Customs and Border Protection; Memorandum D17-1-10, Coding of Customs Accounting Documents, Canada Border Services Agency; Directory of CBSA offices and services, Canada Border Services Agency.

Which US port faces which CBSA office is matched by location; neither agency publishes it as a list.

Adhoc is not affiliated with CBSA or CBP.

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