I. Christensen
I. W. Stephenson
I.S. Bushey & Sons
Illinois Steamship Co.
Imperial Oil Co., Ltd.
Incan Ships, Ltd.
Indian River Towing Co.
Inland Lakes, Ltd.
Inland Lines
Inland Navigation Co.
Inland Steamship Co., Ltd.
Inland Steel Co.
Inter-American Steamship Co.
Interlake Steamship Co.
International Petroleum Co.
International Waterways Nav. Co.
International Waterways, Ltd.
Irving Oil Co.
Island Shipping, Ltd.
Isle Royale Transit Co.
Ives