It is thoroughly confusing. Don't feel you are alone.
Okay: Joffrey Ballet
is our resident professional company. They perform three programs each year, plus Nutcracker, and occasional other appearances (e.g. at Ravinia or Millenium Park). It is well worth subscribing to season tickets. They perform at the lovely old Auditorium Theatre downtown.
At the moment, Joffrey does not have an associated ballet school. However, they are just completing a new building, and rumors have been around that a school will emerge (and I think
AD Ashley Wheater has said he'd like to have one, but I couldn't cite when or where I heard this). So far, there have been no official announcements to my knowledge.
So: there are no schools affiliated with professional companies in Chicago. The two biggest schools in the city proper are Ruth Page
and Ballet Chicago
. Both are well respected, and each has its own flavor. Both have student/civic companies attached.
There are also a bunch of smaller schools in the greater Chicagoland area. Again, each has its own flavor and adherents. Depending on what you are looking for, you might choose to relocate in a suburb close to a particular school, but it would be hard to give you a whole rundown of what's available. There are some other Chicagoland posters who might be able to speak on the studios their DKs dance at, or that they know of.