According to the ATF database, there are 5 registered FFLs in Charleston, Illinois.
517 7TH STREET SUITE ACHARLESTON, IL, 61920
517 7TH ST #ACHARLESTON, IL, 619200000
1803 12TH STREETCHARLESTON, IL, 61920
1475 18TH STCHARLESTON, IL, 61920
15775 E CO RD 300 NCHARLESTON, IL, 61920