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M # Symbol

How to Apply for an M#/Symbol

Manufacturers Symbols

Historical M-Number Logos

Manufacturers Symbols by Identification Number

Manufacturers Symbols by State


How to Apply for an M#/Symbol

Submit a M # Symbol Approval requests using the PHMSA Portal

Applicants also have the option of submitting request via email to approvals@dot.gov, or mailed to [Department of Transportation, East Building, PHH-33, 1200 New Jersey Avenue SE, Washington, DC 20590]

NOTE: Please attach an individual request, when applying online

The M#/Symbol registration request should contain the following:

  • Request Letter as described in 49 CFR 107.705
  • The Request Letter must contain detail information for the purpose of the M#/Symbol and the item that is being mark with the M#. 
  • Provide the name, facility and mailing address, email (optional), and the telephone number of the person on whose behalf the registration or application is made and, if different from the person filing. 
  • If the company seeking registration is an international location, they must provide an U.S. Agent name, company, and contact information attached to their request. 

Requests for confidential treatment must be marked in accordance with 49 CFR 105.30.

Manufacturers Symbols

A symbol or "M Number" is issued to a company as a means of identification. Under certain regulations, the M number must be used solely as the identifier on a package, for example DOT 39 nonrefillable cylinders, 49 CFR 178.65(i)(2). However, other regulations allow the manufacturer to use either the symbol or their name and address as specified in 49 CFR 178.3(a)(2). 

Lists of manufacturer's symbols are in two formats. The first format lists the manufacturers sequentially by Identification Number (M #). The second format lists each state's manufacturers alphabetically by city and company name. The identification number, the name and address, the status and the date of the registration are provided in both formats.

Historical M-Number Logos

Historical M-Number Logos
MI-ALICOALIGAS-BDCOBDH-BX
BEYERS-CFICFM-D. LOWED&CO-E&E
E&JMCO-FABMETFAC-G&LG&M-H&M
H&MCO-I.I.IIA-L&ML&N-LWSUP
LYCO-N&BGCON&CO-OAECOOAG-PYOCO
PYR-S&HGS&M-T&CGCOT&CO-VABCO
VAC-WJGSWJM-12225 

Manufacturers Symbols by Identification Number

Manufacturers Symbols by Identification Number
M1001 - M2999M4001 - M4499M4500 - M4999
M5000 - M5499M5500 - M5999M6000 - M6499
M8000 - M8499  

State Listings (Alphabetical PDF files)

State Listings
AKALARAZCACOCTDCDE
FLGAIAIDILINKSKYLA
MAMDMEMIMNMOMSMTNC
NDNENHNJNMNVNYOHOK
ORPARISCSDTNTXUTVA
VTWAWIWVWYOutside the U.S.
Updated: Monday, July 30, 2018