M # Symbol

How to apply for an M#/Symbol?

All approval applications can be submitted using the Online Application, by 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 Section 107.705 must be sent to the Approvals Office. 
  • 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. 

 

49 CFR References sites for M#/Symbol 

Manufacturer's 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

&MI-ALICO ALIGAS-BDCO BDH-BX
BEYERS-CFI CFM-D. LOWE D&CO-E&E
E&JMCO-FABMET FAC-G&L G&M-H&M
H&MCO-I.I.I IA-L&M L&N-LWSUP
LYCO-N&BGCO N&CO-OAECO OAG-PYOCO
PYR-S&HG S&M-T&CGCO T&CO-VABCO
VAC-WJGS WJM-12225  


Manufacturer's Symbols by Identification Number

M1001 - M2999 M4001 - M4499 M4500 - M4999
M5000 - M5499 M5500 - M5999 M6000 - M6499
M8000 - M8499    



State Listing (Alphabetical PDF files)

AK AL AR AZ CA CO CT DC DE
FL GA IA ID IL IN KS KY LA
MA MD ME MI MN MO MS MT NC
ND NE NH NJ NM NV NY OH OK
OR PA RI SC SD TN TX UT VA
VT WA WI WV WY Outside the U.S.