William C. Mack 60 Indiana Trl, Hopatcong, NJ07843 The Law Offices of William C. Mack is located in Hopatcong, New Jersey. Mack has been practicing law for thirty years…More within several different states. His practice in Hopatcong offers personal and business services in real estate, business and commercial transactions. His clientele are generally in the Sussex, Morris, Passaic, Bergen, Warren, Hunterdon, and Somerset counties. For more information or a consultation please call or visit the website.