Hopatcong is a borough in Sussex County, New Jersey, situated along the southwestern shore of Lake Hopatcong, the largest freshwater lake in the state at approximately 2,500 acres and nine miles in length. The borough's history is inseparable from the lake: during the late 1800s, the Morris Canal system and the arrival of railroads transformed Lake Hopatcong into a fashionable resort destination, drawing vacationers from New York City and beyond. Grand hotels and lakeside estates once ringed the water, and figures such as inventor Hudson Maxim, who owned much of what is now the borough, left a lasting mark on the community. Today Hopatcong is a year-round residential borough where lake life remains the defining feature. Marinas, boat launches, and shoreline homes support boating, fishing, and swimming, and Hopatcong State Park anchors public access at the lake's southwestern end. The borough's housing stock reflects its evolution from a summer resort to a permanent community, mixing lakeside cottages and older homes with more conventional suburban residences on interior streets. While Hopatcong retains a relaxed, recreation-centered feel, its location in the New Jersey Highlands places it within commuting reach of employment centers in Morris County and the broader New York metropolitan area. Interstate 80 passes south of the borough, providing a direct route east and west, and the surrounding lake region spans several municipalities that share marinas, restaurants, and recreation. The lake itself was expanded as a water source for the Morris Canal, and its later rail connections and resort hotels cemented the borough's place as a lakeside destination. The community balances small-town lake living with practical access to the region's road network, making it attractive to year-round residents, boaters, and seasonal lake-goers alike. Families value its outdoor orientation and community schools, while the lake itself ensures that recreation remains woven into everyday life across all four seasons.