Sunflower Bank Online Banking Sunflower Bank was founded in 1892 in Salina, Kansas where it is still headquartered. It is a regional bank that operates branches not only in Kansas but also in Colorado and Missouri offering personal and commercial banking services. • Website – www.sunflowerbank.com • Customer Service Telephone – 1(888)827-5564 • Routing Number – 101100621 • Swift Number – NBFTUS33 Customer Service Telephone 1(888)827-5564 Online Banking Login How to Log In 1. Go to www.sunflowerbank.com. 2. Enter your…