How do i contact hnb customer service? If you have any questions please visit your local branch, email [email protected] or call (888) 460-8723. HNB is confident you will love the new online banking solution as much as we do! The Hiawatha National Bank ("HNB") website is www.hnbank.com and is the only website you should access to transact with HNB.How do i apply for e banking with hnb? If you are an existing customer of HNB, download and complete the application form given below and handover to your nearest HNB Customer Centre. If you need more information, please contact the E Banking Unit on 0112462462.What does hnb mean? Hatton National Bank PLC (HNB) is a leading private bank in Sri Lanka. HNB provides universal financial services to companies, institutional investors and inpiduals.How do i contact hnb bank hannibal mo? HNB Bank. PO Box 1107. Hannibal, MO 63401-1107. Call Us: (573) 221-0050. Toll Free (877) 382-8680. Telephone Banking with Financial Connection: (866) 975-4HNB.