Interstate Navigation Company, Inc. operates the Block Island Ferry and is the only year-round ferry service to Block Island. Based in Point Judith, (Narragansett), Rhode Island, the Block Island Ferry offers traditional ferry service, (55-minute voyage) as well as the fastest ferry trip from the mainland on the high-speed ferry service, (30-minute cruise). If your trip to Block Island is for business, a family vacation, or an island weekend getaway, the Block Island Ferry will get you to Block Island quickly and easily. The Block Island Ferry is the only vehicle ferry service to Block Island. We transport passenger vehicles, and commercial trucks as well as shipping freight. The Block Island Ferry is a full-service ferry company.