Population: 0 (and counting)
Ghost Town Gamma has been abandoned since the great Lost Socks of the People of 1999.
Despite its lack of inhabitants, the town still has a few Haunted Movie Nite screenings every week.
Want to stay for a while? There's a Ghost Town Guesthouse with all the amenities you'll ever need (i.e., a comfy chair and a working toilet).
Visit them at your own risk. Seriously, who needs safety nets?