Florala, Ala.: borders Florida.
Idavada, Idaho: borders Nevada.
Michiana, Mich.: borders Indiana.
Tennga, Ga.: borders Tennessee.
Uvada, Utha: borders Nevada.
Texhoma, Texas: borders Oklahoma.
Marydel, Md.: borders Deleware.
Kanorado, Kan.: borders Colorado.

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"What a waste it is to lose one's mind. Or not to have a mind is being very wasteful. How true that is.".............
Dan Quayle

And, Texarkana - Texas and Arkansas

(Doesn't include the name of the next state, but there's also Texline - Texas and New Mexico.)

Kenova, in now what is West Virginia, is at the conjunction of Kentucky - Ohio - Virginia.