Western Alliance Bank, La Mesa Branch Basic Info Reviews Routing Numbers Map & Direction Name: Western Alliance Bank, La Mesa Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 8379 Center Drive La Mesa, California 91942 San Diego County View other branches Phone: 619-233-2555 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121143260YY121144463YY121202062YY122105980YY122243635YY122401778YY122402298YY122487200YN From: To: