All motor vehicles and trailers used on Alabama highways must be registered. Alabama registers vehicles based on gross weight.
Motor vehicles are registered through license plate issuing offices in the county in which the owner resides. If the owner is a firm, corporation, or association, the motor vehicle is registered in the county the motor vehicle will be used or operated. International Registration Plan (IRP) trucks and truck tractors — operating to points outside of Alabama — are registered through the Department of Revenue, Motor Vehicle Division, Motor Carrier Services Unit.
Agency: Department of Revenue; see Regulatory Agencies for address(es).