This flag on FOTW website
British Antarctic Territory
British Columbia
British Indian Ocean Territory
British Virgin Islands
Burma (1948-1974)
C
Cambodia
Campania
Cape Verde
Cayman Islands
Central African Republic
Chicago
Chile
China - Naval Ensign
China Republic (1912-1929)
Chukotka
Colombia - Civil Ensign
Colombia - Naval Ensign
Colorado
Comoros
Cook Islands
Costa Rica
Costa Rica - State Flag
Crimea