How to apply for an M#/Symbol?
All approval applications can be submitted using the Online Application, by email to firstname.lastname@example.org, 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
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
Manufacturer's Symbols by Identification Number
State Listing (Alphabetical PDF files)