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William J. Lilly CPA is a Long Island CPA firm that provides a wide variety of accounting, tax and financial management services. Our clients are located in towns like Smithtown, Hauppauge, Commack, Central Islip, Hauppauge, Brookhaven, Setauket, Stony Brook, Port Jefferson, Coram, Centereach, Bohemia, Deer Park, and more. We service clients in Suffolk County.