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Here in south-central Texas, it's mainly Nuevo Leon, Tamaulipas, and Coahuila in no particular order. Chihuahua plates are more common in Far West TX and all over NM.
In the Kansas City area, I see a lot of plates from Texas, Oklahoma, Nebraska, South Dakota, Iowa, Minnesota, and a few from the Indian reservations in Kansas and Oklahoma. The Indian reservations actually have their own special license plates because they do not fall under the jurisdiction of the states.
In Maryland (especially more prevalent toward Washington, DC and along I-95):
1. New Jersey
2. New York
3. Florida
4. North Carolina
5. Massachusetts
6. Georgia
7. Ohio
8. Connecticut
9. Illinois
10. South Carolina
The first five are a nearly daily occurrence for those who commute along the interstates or main highways, with the others appearing quite often. I see a California plate approximately once every 200 miles or so driving, and even Texas, Michigan, Kentucky, Tennessee, Oregon, Washington state, Minnesota, Alabama, Louisiana, Rhode Island, Ontario, Quebec, and northern New England states aren't that rarely seen. It seems like the mountain west (outside of Colorado) plains states, Hawaii (of course), and Mississippi seem to be seen the least and you may see one once a year if you're lucky, and I've never seen a Mexican plate or Canadian plate outside of ON, QC, or NB plate.
FYW for the bordering states, first off, it depends where in Maryland you're from. North of Baltimore, Pennsylvania is by far the most common. West of Frederick, there is a unique mix of PA, Virginia, and West Virginia plates, though west of Hagerstown, there aren't as many Virginia plates. On the western shore, it's mostly Virginia plates with a few PAs in the DC suburbs and only a smattering of DE and WV plates, about an even number of VA and PAs in Anne Arundel and Howard county (with the similar amount of fewer DE and WV plates), and east of the bay from Cambridge north, Delaware is the most common, except during summer and shoulder season weekends when tourists/vacationers plop along the highway towards the beach resorts. The lower eastern shore is a mix of DE/VA plates, with the VA plates increasing as you approach its eastern shore.
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