Why does Wells Fargo have two routing numbers?

AMG National Association Trust Bank 14 Apple River State Bank 13 Bank of Clarendon 9 BANK OF THE PACIFIC 3 BLC Community Bank 29 CITY State Bank 8 Denison State Bank 17 FIRST National Association B&TC 19 First National Bank of Absecon 3 Karnes County National Bank 9 LINCOLN SVGS Bank 13 Mayville State Bank 12 MONTGOMERY Bank 8 Pony Express Bank 15 RNB State Bank 12 Security Bank of Southwest Missouri 5 State Bank of Toledo 11 State Bank of Wynnewood 3 Trinity Capital Bank of Texas 9 Verus Bank of Commerce 2