See if your license number is on your vehicle registration. If you had a learner's permit, it may have a different number than a full driver's license.Ģ. For example, if you have a US driver's license from one state, your license number typically won't be the same if you find an expired license that was issued in another state. Keep in mind that different licensing agencies use different numbers. If you saved them in your personal records, you may be able to find your number that way. If you have any expired driver's licenses issued by the same licensing agency, they'll typically have the same number as the one you lost.