Here are the states that require a DOT #

US States that require you to have a DOT Number to operate.

Apart from federal FMCSA regulations, some states require commercial motor vehicle registrants to obtain a USDOT #. These states include:
•Alabama
•Alaska
•Arizona
•Colorado
•Connecticut
•Florida
•Georgia
•Indiana
•Iowa
•Kansas
•Kentucky
•Maine
•Maryland
•Michigan
•Minnesota
•Missouri
•Montana
•New Jersey
•New York
•Nebraska
•North Carolina
•Ohio
•Oklahoma
•Oregon
•Pennsylvania
•South Carolina
•Tennessee
•Texas
•Utah
•Washington
•West Virginia
•Wisconsin
•Wyoming

You are required to obtain a USDOT number if you have a vehicle that:
•Is used in transporting material found by the Secretary of Transportation to be hazardous and transported in a quantity requiring placarding (whether interstate or intrastate).

OR
•Has a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight, of 4,536 kg (10,001 pounds) or more, whichever is greater; or
•Is designed or used to transport more than 8 passengers (including the driver) for compensation; or
•Is designed or used to transport more than 15 passengers, including the driver, and is not used to transport passengers for compensation.

FMCSA’s QCMobile app can be used to verify an entity’s operating authority and USDOT number. The new app will provide the functionality previously provided by the automated phone system, plus access to USDOT number status information. Users of Apple or Android smartphones or tablets can download this app from the iTunes App Store (Apple) or the Google Play Store (Android) at no cost.

AND is involved in Interstate commerce: Click here to do a test to see if you need a DOT #.

Notice for Sole Proprietors
•Sole proprietor owner/operator are strongly encouraged to obtain an EIN rather than using an SSN to register for operating authority.
•If a sole proprietor owner/operator submits personal information for registration purposes to obtain a USDOT number or operating authority, this information will be publically available on FMCSA websites. This published information may include, but is not limited to, the sole proprietor owner/operator’s home address, telephone number and email address when the contact information serves as the business contact information. source: https://www.fmcsa.dot.gov/registration/registration-forms#Process-Agent