Andover is a small borough in Sussex County, in the rural northwestern corner of New Jersey, set within the Kittatinny Valley. Its population was 728 at the 2020 census, making it one of the county's smallest municipalities. The borough is geographically surrounded by the much larger Andover Township, and the two communities function closely together, sharing schools and a common identity even as they remain separate municipalities. The borough's compact size gives it a distinctly small-town, walkable feel within a broader landscape of forests, farms, and lakes. It sits near Route 206, the principal north-south corridor through Sussex County, and is within reach of Newton, the county seat, to the north. This position places Andover at a practical distance from the region's larger employment and commercial centers while retaining the quiet, rural character for which northwestern New Jersey is known. Andover is served, together with Andover Township, by the Andover Regional School District for students in pre-kindergarten through eighth grade, with high school students attending Newton High School. This shared arrangement reflects the close relationship between the borough and the surrounding township and gives local students a continuity of education through the regional system. Recreation is a defining part of life in Andover. The Kittatinny Mountains rise nearby, and Sussex County's extensive parkland, including Stokes State Forest and High Point State Park, lies within easy reach, along with the Delaware Water Gap National Recreation Area. Lakes, trails, and open countryside surround the borough, making it a base for an outdoors-oriented way of life in one of the state's most scenic regions. Andover offers residents a quiet, close-knit community and ready access to the outdoor recreation of New Jersey's northwest, all within commuting distance of the state's larger centers.