Can a foreign (non-US) carrier file a BOC-3?
Yes. A foreign motor carrier with FMCSA interstate operating authority (typically Mexican-domiciled OP-1MX carriers under §365.501 or Canadian carriers under the U.S.-Canada cross-border framework) is required to file Form BOC-3 just like a U.S. domestic carrier. Foreign carriers usually file through a U.S.-based blanket-coverage process-agent provider because they have no U.S. office.
The 49 CFR §366 process-agent regulation applies to any entity holding FMCSA interstate operating authority, regardless of the entity's country of domicile. Mexican-domiciled long-haul carriers operating into the U.S. under OP-1MX authority, Canadian-domiciled carriers operating across the U.S. border, and U.S.-domiciled carriers all file the same Form BOC-3.
For Mexican-domiciled carriers, the FMCSA Mexico Office processes OP-1MX applications and the BOC-3 filing is a standard part of the application packet. The carrier names a U.S.-based registered process agent in every state because the §366 process-of-service requirement contemplates U.S.-based service of legal documents — no foreign agent has standing to accept U.S. legal service. Mexican carriers typically use the same blanket-coverage providers as U.S. domestic carriers.
For Canadian-domiciled carriers, the cross-border framework allows operation in the U.S. under specific reciprocity rules, but BOC-3 is still required for any operation that places the carrier under FMCSA jurisdiction §13501. Canadian carriers can self-designate in border states where they have actual physical presence (warehouses, terminals), but most use blanket-coverage providers for the remaining states.
For all foreign carriers, the BOC-3 designation must use U.S. street addresses for the process-agent lines. Foreign addresses are not accepted on Form BOC-3 — the FMCSA L&I system rejects any line with a non-U.S. address. This is why the blanket-coverage model is the dominant pattern for foreign carriers.
The fee structure for foreign carriers is identical to domestic — no premium for foreign domicile, no different processing path. A flat-fee BOC-3 from a U.S. provider lands at the same $50-$75 price point regardless of where the carrier is based.