McDonalds (Colerain & Northgate) - COBCO Enterprises Share: Restaurants McDonalds (Colerain & Northgate) - COBCO Enterprises Visit Website 8339 Colerain Ave. & 9677 Colerain Ave. Cincinnati, OH 45239 (513) 841-2444 (513) 841-2555 (fax) About About COBCO Enterprises owns and operates McDonald's restaurants in the Cincinnati area. McDonald's is the world's largest chain of restaurants, serving millions of customers each day.