FIRMS code

H450 US POST OFFICE

Active Importer's premises

Facility details

FIRMS code: H450
Name: US POST OFFICE
Address: 515 W 1st St, 209 Federal Building
Duluth, MN 55802-1302
Status: Active (A)
Facility type: Importer's premises (06)
CBP port: Duluth, Mn-Superior, WI (3510)
CBP region: 3
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate H450 before you file

Check H450 against the port and use on your filing before ACE does: list, status, port (ACE 164) and facility type.

curl https://api.firmsapi.com/v1/validate \
  -H "x-api-key: $FIRMSAPI_KEY" -H "content-type: application/json" \
  -d '{"code":"H450","port":"3510","use":"location_of_goods"}'

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Other codes at this address

Many facilities hold several FIRMS codes, for example one per facility type or operator.

Code	Name	Type	Status
H417	SCI DULUTH SUPERIOR	CBP administrative site	Active
H419	CUSTOM HOUSE	CBP administrative site	Active

Nearby facilities in the same port

Code	Name	Type	Distance
HBL3	USCBP Cruise Ship Facility (DECC)	Inspection facility	711 m
H493	CUTLER SALT DOCK	Pier or terminal	808 m
H842	GENERAL MILLS ELEVATOR A	Pier or terminal	1.5 km
HAN7	Riverland Ag Corp.	Inspection facility	1.8 km
I820	AGP Grain Ltd.	Pier or terminal	2.3 km

Source: U.S. Customs and Border Protection FIRMS code list, data as of 2026-10-23. FIRMSapi is not affiliated with CBP; confirm bond status and filing details in ACE.