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Donate Now!

Be the puff in our marshmallow, the volume in our cheers,
the reason we make Incredible Camp O Campers.

Support Camp Ondessonk with a gift to our Annual Appeal!

Donate Online Here


Year Round

Camp Ondessonk is open year round for groups of all kinds. Whether you want a quiet weekend with your family or want to bring 200 sixth graders for a week of environmental education, Camp Ondessonk’s Year Round programming will meet your needs.  It is advised that weekend groups contact Camp first to inquire about availability and make reservations several months in advance – especially larger groups wanting meals and programs and for dates during the busier months of April, May, September, and October.  Call (618) 695-2489 or email greg.santen@ondessonk.com


Ondessonk Maps

Ondessonk Rules and Regulations


If you have any questions, please feel free to contact:

Greg Santen – Guest Services Director


(618) 695-2489 ext. 129

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