About 18 months ago I was interviewing for a job at WICN, another FT jazz station and I did a little research. I searched on "formats" at radio-locator.com (not the most precise of tools, but it was a decent enough place to start) and found there were 47 stations in the entire USA listed as "jazz" stations.
If you eliminate stations in the top 20 markets, and stations owned by educational institutions, the number drops to two: WICN, Worcester, MA, and KRML, Carmel, CA. And KRML is commercial, so WICN was the only non-major-market, non-college-owned, FT non-commercial jazz station in the USA.
Also, you didn't mention KUVO in Denver, which was all-jazz, but had gone to The Takeaway in mornings but dropped it to go all-jazz again when the Takeaway moved to mid-days.