O'Hara Corporation has been in business in Rockland, Maine for well over fifty years. The company has its roots in Boston where it started in the fishing industry. Buying and selling fish, and owning and operating fishing boats was the primary focus of the company for many years. During the first half of the twentieth century the business spread from Boston to the Maine towns of Portland, Eastport, and Rockland. After riding the crests and troughs of the fish business for a hundred years, the company's headquarters was established in Rockland.
The company still maintains its presence in the East Coast fishery with several boats in the scallop and herring business.