FIRMS code

M301 POST OFFICE

Name: POST OFFICE
Address: GPO PAMPANOS, PONCE, PR, 00731, US

Active Importer's premises

Facility details

FIRMS code: M301
Name: POST OFFICE
Address: GPO PAMPANOS
PONCE, PR 00731
Status: Active (A)
Facility type: Importer's premises (06)
CBP port: Ponce, PR (4908)
CBP region: 4
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate M301 before you file

Check M301 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":"M301","port":"4908","use":"location_of_goods"}'

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Nearby facilities in the same port

Code	Name	Type	Distance
M288	MUNICIPAL PIERS	Pier or terminal	435 m
LA85	LT Autos, LLC 01	Foreign trade zone	522 m
M287	CUSTOMS OFFICE PONCE	CBP administrative site	2.0 km
M289	AP PROPERTIES INC	Bonded warehouse	2.1 km
LC38	Liquilux Gas Corporation 01	Foreign trade zone	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.