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Contact Us

Let us know your thoughts and ideas.


  • Have questions or suggestions for our organization?  
  • Want to be involved with COS?
  • Do you have a conservation concern for birding in the Chicago area that COS should know about? 
  • Do you want to co-sponsor or invite our members to an event?
  • Do you have a trip or program you would like to present with us?


Or write us via snail mail:

Chicago Ornithological Society

332 South Michigan Avenue, Ste 1032

Chicago, IL 60604