FIRMS code

W506 US POSTAL SERVICE-MAIN OFFICE

Name: US POSTAL SERVICE-MAIN OFFICE
Address: 337 W CLARK ST, EUREKA, CA, 95501-9903, US

Active CBP administrative site

Facility details

FIRMS code: W506
Name: US POSTAL SERVICE-MAIN OFFICE
Address: 337 W CLARK ST
EUREKA, CA 95501-9903
Status: Active (A)
Facility type: CBP administrative site (08)
CBP port: Eureka, CA (2802)
CBP region: 7
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate W506 before you file

Check W506 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":"W506","port":"2802","use":"location_of_goods"}'

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Nearby facilities in the same port

Code	Name	Type	Distance
W503	SIERRA PACIFIC INDUSTRIES	Importer's premises	956 m
W508	FAIRHAVEN TERMINAL	Importer's premises	1.9 km
W509	STOCKTON PACIFIC ENTERPRISES INC.	Importer's premises	2.7 km
W507	HUMBOLT BAY FOREST PRODUCTS	Inspection facility	8.5 km
W505	US POSTAL SERVICE-MAIN OFFICE	CBP administrative site	10.9 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.