There are 10 real estate agents found in Wellesley Island, NY. View our Wellesley Island real estate area information to learn about the weather, local school districts, demographic data, and general information about Wellesley Island, NY. Get in touch with a Wellesley Island real estate agent who can help you find the home of your dreams in Wellesley Island. Use our mortgage calculator to see how much it would be to finance a home in Wellesley Island. Not ready to buy yet? Find and compare apartments for rent in Wellesley Island.