Frontier Bank 323 Main St Little Rock, IA 51243 Phone : (800) 300-6796 Business Category Banks Personal Loans Services           Checking, Equal Housing Lender Frontier Bank 3501 W 57th St Sioux Falls, SD 57108 Phone : (800) 300-6796 Frontier Bank Business Category Banks Personal Loans Mortgage Bankers & Real Estate Loans Automated Teller Machines (Atm) Savings & Loans Services           Checking