Segundo informação do Airliners, pode até 14 passageiros.
Capacity208A - Pilot and typically nine passengers, or up to 14 with an FAA FAR Part 23 waiver. Cargo capacity 1360kg (3000lb). 208B - Passenger accommodation same. Cargo capacity for 1587kg (3500lb). Grand Caravan - One pilot and up to 14 passengers.
http://www.airliners.net/aircraft-data/cessna-208-caravan-i-grand-caravan-cargomaster/158