How many children attend summer camps in Canada?

According American Camp Association's recent data. There are nearly 12,000 Traditional Summer Camps in the U.S. Out of those 7000 are Overnight camp while the rest are Day Camps. Only 2,500 summer camps operated in the country is independently owned and for-profit while most are run by Non-profit groups like YMCA, Camp Fire USA, just to name a few. 80% of the camps are considered co-ed and offer many programs beyond traditional Archery, swimming, hiking and rope climbing. Specialty Camps are on the rise.

Check out ACA's website, they have very comprehensive directory where you can search for camps based on location, price range, program, gender, special needs, etc.