Here is the list of Top 20 Markets. Four have no Classical station. A couple have part time Classical outlets.
1. NYC...105.9 WQXR
2. Los Angeles...91.5 KUSC (with simulcast stations in Santa Barbara and Ventura.)
3. Chicago...98.7 WFMT
4. San Francisco...90.3 KDFC (with simulcast stations in San Jose and Napa Valley.)
5. Dallas...101.1 WRR (Still a commercial station, owned by the City of Dallas.)
6. Houston...No station. (91.7 KUHA was sold to a religious broadcaster.)
7. Atlanta...No station. (90.1 WABE once played some Classical music but is now NPR News and Info.)
8. Washington...90.9 WETA-FM (Often in the Top 10.)
9. Philadelphia...90.1 WRTI (Classical by day/Jazz at night, plus all-Classical WWFM in the suburbs.)
10. Boston...99.5 WCRB
11. Miami...no station (93.1 WTMI used to be a fulltime commercial classical outlet.)
12. Seattle...98.1 KING (Recently made the transition from commercial to listener-supported.)
13. Phoenix...89.5 KBAQ
14. Detroit...90.9 WRCJ (Classical by day/Jazz at night, plus CBE-FM in Windsor has some Classical programming.)
15. Minneapolis...99.5 KSJN
16. San Diego...No station. (104.9 XHLNC Tijuana once served both cities with automated classical. All announcements were in both English and Spanish. That ended when its owner died a few years ago.)
17. Tampa...89.1 WSMR (from Sarasota, with a Tampa translator.)
18. Puerto Rico...91.3 WIPR-FM (Spanish)
19. Denver...88.1 KVOD
20. Long Island...105.9 WQXR (from New York. The signal only covers part of L.I.)
In Canada, Toronto and Montreal have full time commercial classical stations. Toronto's CFMZ 96.3 is sometimes in the Top 5 stations. In Montreal, 99.5 CJPX is French Classical. The CBC has two FM networks, one English, one French, with some Classical hours, "CBC Music" and "SRC Ici Musique."