FIRMS code

K501 GMAC WENTZVILLE PLANT

Deleted Foreign trade zone

This code is deleted in CBP's FIRMS list. Don't use it on new filings. FIRMSapi keeps deleted codes so lookups of old paperwork still resolve; check the port listing for a replacement.

Facility details

FIRMS code: K501
Name: GMAC WENTZVILLE PLANT
Address: 1500 EAST ROUTE A
WENTZVILLE, MO 63385
Status: Deleted (D)
Facility type: Foreign trade zone (02)
CBP port: St Louis, MO (4503)
CBP region: 3
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate K501 before you file

Validation fails K501: it's deleted, the reject ACE returns as 159. Search the port for an active replacement.

curl https://api.firmsapi.com/v1/validate \
  -H "x-api-key: $FIRMSAPI_KEY" -H "content-type: application/json" \
  -d '{"code":"K501","port":"4503","use":"ftz_admission"}'

Get a free key Validation guide

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.