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GYM BLEACHER REPLACEMENT PROJECT DONATE NOW. Click to Donate A Proud Tradition and A Promising Future The Catholic Youth Organization CYO of Mercer County is a public benefit community organization that enhances the lives of Greater Mercer County youth and their families by providing affordable quality educational and recreational services. Rooted in the Catholic Tradition the CYO provides these services in an inclusive and nondiscriminatory manner respecting the culture and faith of all. Founded in 1961 more than 100000 young people have walked through the Broad Street doors of the CYO Center in Trenton or played at the CYO Camp on YardvilleAllentown Road in Hamilton.