unless they are a pirate, they would have a license. Same FCC division issues those as for commercial broadcast, Part 73. somewhat different rules for commercial vs non-commercial stations. If they are below 92.1, they are non-commercial, although there are non-comms above that as well. All commercial stations will be above 92.1.
Check
www.fccinfo.com , a great resource to look up broadcast license info...
na6df