Wasn't positive where this fell, but UPSL is expanding to relatively close to me in Lincoln, Nebraska. https://www.bugeatersfc.com/news/2017/12/11/nebraska-bugeaters-fc-launched-in-lincoln
The UPSL is not affiliated with the USL or PDL. I'd guess the best place for UPSL discussion is on the "Soccer in the USA" board or on the "College & Amateur Soccer" board. There is a thread on the C&A board that discusses regional leagues. There is some UPSL discussion in there. https://www.bigsoccer.com/threads/regional-amateur-adult-leagues.2027159/