A scenic close up picture taken of a Seattle ferry boat in the Puget Sound. This ferry boat is leaving the shore. Washington State Ferries operates the largest ferry fleet in the United States. Twenty-eight ferries cross Puget Sound and its inland waterways, carrying over 26 million passengers to 20 different ports of call. From Tacoma, Washington, to Sidney, British Columbia, they travel up and down the Sound, acting as a marine highway for commercial users, tourists and daily commuters alike.