Happy State Bank, Coulter Branch Basic Info Reviews Routing Numbers Map & Direction Name: Happy State Bank, Coulter Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 5100 S. Coulter Amarillo, Texas 79109 Randall County View other branches Phone: 806-359-8811 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer111017791YN111305115YN111307469YN111310870YY111321144YN111322729YY From: To: