Dunellen's housing stock reflects its origins as a compact railroad borough. Homes are predominantly older single-family styles—small colonials, Cape Cods, ranches, and split-levels—many on lots of less than a fifth of an acre, along with apartment complexes and some higher-density rental housing. The closely built, prewar street grid gives the borough an established, walkable character rather than a suburban subdivision feel. Inventory tends to be modest in size and price relative to nearby towns, making Dunellen a common entry point for first-time buyers and commuters. Because the borough is fully developed, new construction is rare, and buyers should expect renovated older homes over new builds.

Dunellen is organized around its downtown and railroad corridor, with State Route 28 bisecting the borough as its main commercial street. Residential streets radiate outward from this center in a tight grid, and the area near King Court and King George Road is among the recognized residential pockets. The borough's neighborhoods are defined less by large planned subdivisions than by their proximity to the train station, downtown, and schools, with quiet side streets of older single-family homes a short walk from services. The transition from Dunellen into neighboring Piscataway, Green Brook, and Plainfield is seamless, with the rail line and Route 28 marking the clearest internal boundaries.

Dunellen offers a walkable, commuter-oriented small-town lifestyle unusual for central New Jersey's highway suburbs. The borough's compact size means most residents can reach downtown shops, the train station, and local parks on foot, and the Raritan Valley Line puts a car-free commute toward Newark and New York within reach. Community life centers on the schools, the downtown along Route 28, and the railroad heritage that gives the borough its identity. Housing is modest and closely spaced, fostering a dense, neighborly feel, while nearby Middlesex County and the Watchung foothills provide recreation. Dunellen appeals to commuters and households seeking affordability, walkability, and rail access in a tight-knit setting.

Dunellen is served by Dunellen Public Schools, a comprehensive community public school district covering pre-kindergarten through twelfth grade for borough residents. The district operates three schools and enrolls roughly 1,400 students, giving it a small, self-contained character in which students typically progress through the system together from elementary school to Dunellen High School. The compact geography of the borough means most students live within walking distance of their schools, a notable advantage in a car-oriented region. Families value the district's community focus and the continuity of a single K-12 system, and nearby Middlesex County offers extensive higher education and specialized program options.

Dunellen's defining transportation asset is its NJ Transit station on the Raritan Valley Line, the only stop on that line within Middlesex County. The line provides direct service toward Newark, where riders transfer for New York Penn Station, making the borough a practical rail-commuting option. By road, State Route 28 bisects Dunellen as its main east-west artery, connecting to nearby U.S. Route 22 and Interstate 287, which link the borough to the wider central New Jersey highway network and employment centers. The compact, sidewalk-oriented layout also supports walking and local bus connections, giving Dunellen a transit-friendly profile unusual for a borough of its size.

Recreation in Dunellen centers on its local parks and playing fields, which serve the borough's densely settled neighborhoods, along with the regional open space of the Watchung foothills just beyond its borders. Washington Rock State Park, one of New Jersey's oldest state parks, sits atop Watchung Mountain in neighboring Green Brook Township and offers a scenic overlook, hiking, and picnicking with a view across the Raritan Valley. The borough's compact layout encourages walking and biking to local amenities, and its Raritan Valley location places county parks, the Watchung Reservation, and the recreational facilities of surrounding Middlesex and Somerset counties within a short drive for residents.