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Welcome to Neptune Diner, one of the best dining and restaurant establishments, conveniently located at 5001 State Highway 23 in Oneonta, NY (Off Exit 15 on I-88). Our baked goods are prepared on premises. We serve cocktails and the only the finest coffee. We're open 24 hours a day, 7 days a week. Neptune Diner can be found adjacent to Susquehanna River, near the cities of West Oneonta, Laurens, Otego, and Portlandville.