First Interstate Bank, Riverton Branch Basic Info Reviews Routing Numbers Map & Direction Name: First Interstate Bank, Riverton Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 323 East Main Street Riverton, Wyoming 82501 Fremont County View other branches Phone: 307-857-5335 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer092901272YN092901641YN092901683YY102300129YN From: To: