Sentinel Federal Credit Union ← View details 18 Mount Rushmore Road, Custer, SD 57730 +1 605-923-1405 sentinelfcu.org Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 08:00 am — 05:00 pm Tuesday: 08:00 am — 05:00 pm Wednesday: 08:00 am — 05:00 pm Thursday: 08:00 am — 05:00 pm Friday: 08:00 am — 05:30 pm Saturday: 09:00 am — 12:00 pm Your comments * — Required information