You gotta meet them through the encounter menu, they are not on the map
Viewing post in Broken Dreams Correctional Center comments
In game their is a button called me.
Click it and you will find the encounter menu.
The encounter menu let's you see who you can encounter and limit the species and gender of who you encounter or increase it.
Basically do you want a mostly female/male prison? Do you want to not see any humans/any other species on the prison?