There were a number of individuals and websites that were instrumental in providing information about the clocks in Seattle. Below, I list as many as I can remember.
Carol Valenta from Sound Transit provided excellent background information for the clocks associated with the Metro bus tunnel. She coordinated arts for the tunnel project while at Metro.
Jerry Martin, who has restored and done maintenance on many of Seattle's clocks, gave me lots of great info, especially about F.X. McRory and Bank of America.
Mary McLean from F.X. McRory pointed me to Mr. Martin.
Karen Gordon from Seattle's Department of Neighborhoods
A kind soul at Seattle Metropolitan Credit Union who corrected some of my data.
Owner of Belltown Billiards.
Thomas D. Erb from Electric Time Company.
City of Seattle Historic Preservation
City of Seattle Legislative Database
Great Streets' Seattle Street Clocks - surprisingly I didn't find this site until I was nearing completion!
History Link - Washington State History