About Frontier    Products & Services    Careers    Locations    Freedom Club    Calculators    Sioux Falls 3501 West 57th Street Sioux Falls, SD 57108 (605) 331-2889 Rock Rapids 301 First Avenue Rock Rapids, IA 51246 (712) 472-2537 Little Rock 323 Main Street Little Rock, IA 51243 (712) 479-2286 CONTACT US To contact Frontier Bank, fill out the form below. Required fields are marked with an asterisk (*).  Information Request Form  NAME*: COMPANY: EMAIL*: ADDRESS: CITY: STATE/PROVINCE: POSTAL CODE: PHONE*: SEND TO: Bank Headquarters Rock Rapids Little Rock Sioux Falls Frontier Insurance Frontier Real Estate Freedom Club COMMENTS/QUESTIONS: Customer Privacy Statement © 2004 Frontier Bank. FDIC Insured. Equal Housing Lender.