Apart from federal regulations, some states require their intrastate commercial motor vehicle registrants to obtain a USDOT Number. As of Feb 2017 the 32 states which require DOT #’s are:
Alaska – DOT # required for CMV 10,001 GVW or more. Alaska DOT 907-365-1210
Alabama – DOT # required for CMV 26,001 GVW or more Alabama DOT 334-242-2999
Arizona – DOT # required for CMV
California – Carrier ID http://www.chp.ca.gov Motor Carrier of Property Permit http://www.dmv.ca.gov 916-657-6803
Connecticut – DOT # required for CMV 10,001 GVW or more Connecticut DOT 800-842-8222
Colorado – DOT # required for CMV 26,001 GVW or more Colorado DOR 303-205-5607
Florida – DOT FL # required for CMV 10,001 GVW or more Florida DOT 850-488-7920
Georgia – DOT GA # required for CMV 10,001 GVW or more Georgia DOR 404-675-6135
Indiana – DOT # required for CMV 10,001 GVW or more Indiana DOR 317-615-7200
Kansas – DOT KS # required for CMV Kansas Corp Comm 800-832-5660
Kentucky – DOT KY # required for CMV 10,001 GVW or more KY Trans Cabinet 502-564-4127
Maine – DOT # required for CMV 26,001 GVW or more Maine State Police 207-624-8939
Maryland – DOT MD # required for CMV 10,001 GVW or more MD State Hwy Admin 410-582-5739
Michigan – DOT # required for CMV 10,001 GVW or more State Police 888-464-8736
Minnesota – DOT # required for CMV 10,001 GVW or more MN State Patrol 651-405-6060
Missouri – DOT MO # required for CMV 10,001 GVW or more Missouri DOT 866-831-6277
Montana –DOT # required for CMV
New Jersey – DOT # required for CMV
New York – DOT NY # required for CMV 10,001 GVW or more New York DOT 866-881-2630
North Carolina -DOT NC # required
Ohio – DOT OH # required for CMV 10,001 GVW or more OH Bureau of MV 614-777-8400
Oklahoma – DOT OK # required for CMV 26,001 GVW or more OK Corp Comm 405-521-3246
Oregon – DOT OR # required for CMV 10,001 GVW or more Oregon DOT 503-378-6699
Pennsylvania – DOT # required for CMV
South Carolina – DOT # required for CMV
Tennessee – DOT # required for CMV 10,001 GVW or more TN Dept of Safety 615-687-2260
Texas – DOT # required for CMV 10,001 GVW or more Texas DOT 800-299-1700
Utah – DOT UT # required for CMV UT State Tax Comm 810-297-7780
Washington – DOT # required for CMV 26,001 GVW or more WA Dept of Licensing 360-664-1858
West Virginia – DOT # required for CMV – WV Pub Svc Comm 304-340-0483
Wisconsin – DOT # required for CMV
Wyoming – DOT WY # required for CMV 26,001 GVW or more WY DOT 307-777-4772
The source for this information is from FMSCSA 2017. For example FMCSA notes the following states as requiring DOT Registration
States can change, or upgrade their requirements. Check with states that don’t require DOT registration as noted above: just to make sure there are no surprises. To ASSUME makes an ASS of U and Me. Drive safe, DOT helps make it so.
Fleet D.O.T. & Safety Compliance 
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