Many of the best longer term markets are in a correction now (TX/FL).There is no particular formula, but the closest proxy would be population growth and 10Yr historical price increase which aggregates many factors together.

call the closest ones and then expand the search radius until you find one.

The closest gas stations are 3, 4, and 5 miles away.

Or they will go on the Airbnb map and look for properties closest to DIsney. 2.

What are the closest markets where it is still legal?

Some do, but you may also have to dig some.Probably our closest office to you is Litchfield and McDowell.

Saint Louis, MO is the closest major city.

., which is the closest I can to Camp Pendleton, where I am stationed.

DMU is the closest to a campus environment, but it's small and it will be relocating to West Des Moines soon so I'm not sure what that means for those apartments...Maybe Ames is worth a look if you are actually looking for college rentals. 

Closest major city is an hour away.