Bank of the Sierra, Arroyo Grande Branch Basic Info Reviews Routing Numbers Map & Direction Name: Bank of the Sierra, Arroyo Grande Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 1360 East Grand Avenue Arroyo Grande, California 93420 San Luis Obispo County View other branches Phone: 805-473-6560 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer121137027YY122242526YN122242827YN From: To: