STARTING SERIAL NUMBER ROUTING TRANSIT NUMBER 10 DIGIT ACCOUNT NUMBER. 56 55 54 53 52 51 50 49 48 47 46 45. Union Bank, N.A. uses Check Imaging technology for reading checks and deposit slips in accordance with ABA/ANSI X9.7-1999 (for checks) and ABA/ANSI. X9.33 (for deposit slips) for printing content and design. Union Bank does not allow variation or alterations of the format as shown on reverse, unless prior.