Denny's Restaurants Address25010 Hesperian Boulevard, Union City, Hayward, US Phone+1-510-925-2771 Websitehttps://locations.dennys.com/CA/HAYWARD/249621 AreaUnion City, Hayward, United States Open on map Directions Back to directory search ☆ ☆ ☆ ☆ ☆ Submit