Robert J. Miller Air Park (IATA: MJX, ICAO: KMJX, FAA LID: MJX, formerly N44), also known as the Ocean County Airport, is a county-owned public-use airport that straddles the border of Berkeley Township and Lacey Township in Ocean County, New Jersey, United States.

It is located five nautical miles (6 mi, 9 km) southwest of the central business district of Toms River, New Jersey.

[3] The airport covers an area of 822 acres (333 ha) at an elevation of 86 feet (26 m) above mean sea level.

[1][4] For the 12-month period ending October 31, 2022, the airport had 38,550 general aviation aircraft operations, an average of 106 per day.

At that time there were 64 aircraft based at this airport: 53 single-engine, 8 multi-engine, 1 jet, and 2 helicopter.