Landmark Credit Union Address: 1400 Horicon St, Mayville, WI 53050 Phone: (262) 796-4500 Hours: Mon: 9am-5:30pm Tue: 9am-5:30pm Wed: 9am-5:30pm Thu: 9am-5:30pm Fri: 9am-6pm Sat: 9am-12pm Banks Other Businesses: Horicon Bank at 1440 Horicon St, Mayville, WI 53050 American Bank at 1802 Horicon St, Mayville, WI 53050-1478 Mayville Inn Motel at 701 S Mountain Dr, Mayville, WI 53050 The Audubon Inn at 45 N Main St, Mayville, WI 53050 Park Bank at 205 S Clark St, Mayville, WI 53050