And some were built elsewhere, such as KTWU at Washburn University in Topeka, which was on channel 11. Interesting enough, once translators were transformed into LPTVs, KU built an LPTV on channel 6.
@route56 probably knows a lot more about that than I do.
The University of Missouri's KOMU became all-commercial after the FCC turned down an MU proposal to operate half-time commercial and half-time educational. Central Missouri had no noncommercial allocation until 1965. That one almost was lit up in the 1990s when St. Louis's KETC proposed building a satellite station in Columbia, but then the digital transition happened and channel 36 instead became the transitional UHF frequency for...KOMU. The public TV station that finally did arrive in central Missouri was on a commercial allocation, and once had operated commercially. (Edit: I wrote this in a slightly misleading way and need to clarify it. KMOS in Sedalia actually became an educational station in 1979, but did not have a good signal in much of central Missouri until it erected a tall tower near Syracuse, Missouri, in the 2000s.)
As for Broomfield's PBS12, it is definitely a secondary service (in the sense of not having first dibs on PBS programming, not in technical terms). Rocky Mountain PBS (KRMA) is primary, with stations in Denver, Pueblo, Durango, Steamboat Springs, and Grand Junction, plus numerous translators. As far as I can tell, the Broomfield station doesn't have that kind of reach.
(Multiple edits here; sorry, as I was typing the original post, an ocular migraine took hold and I was struggling somewhat just to get the post written.)