Fairfield is a borough located in Essex County, New Jersey. Essex County is situated in the northeastern part of the state and is bordered by Passaic County to the north, Union County to the east, Morris County to the west, and Hudson County to the southeast. Fairfield is a relatively small borough, covering an area of about 10 square miles.

It is primarily a residential community with a mix of suburban and rural areas. The borough is known for its scenic landscapes, including parks, lakes, and nature reserves, making it an attractive place to live for those seeking a peaceful and natural environment.

Essex County, where Fairfield is located, is also home to several other municipalities, including Newark, the largest city in New Jersey. The county offers a diverse range of attractions and amenities, such as shopping centers, restaurants, cultural institutions, and recreational facilities.

It is well-connected to other parts of the state and the New York metropolitan area through major highways and public transportation systems. Overall, Fairfield benefits from its location within Essex County, providing residents with access to a wide range of services and opportunities while still maintaining a small-town atmosphere.