Saw a couple this weekend. Rural North Dakota is unsurprisingly full of ghost towns. Kind of weird seeing things like old post offices and schools in disrepair and falling apart. Often there's still inhabitants in the town technically because there's still some farms in the area but it can't really be regarded as a "town" anymore.
A few I saw:
Burt, ND
Raleigh, ND
Heil, ND
Leith, ND (not quite a ghost town yet as a bar is still open but nearing there. You might've heard of this place a few years ago as a white supremacist tried to buy up property and move his followers in and take over the population: 15 town. It failed.)
If you're ever driving through I-94 in ND there's a near ghost town you can see just off the Interstate in Stutsman County: Crystal Springs. It today consists of only a church and a single house that's still occupied, but there's some cool abandoned buildings scattered around the area too.
Also here's a site to check out if this intrigues you:
http://www.ghostsofnorthdakota.com