The mainside area of Naval Weapons Station (NWS) Earle is situated on 10,000 wooded acres in the town of Colts Neck and is surrounded by horse farms and orchards. The waterfront complex is located approximately 15 miles away on the Sandy Hook Bay in Leonardo. The two sections are connected by a government-owned, restricted access highway and railroad. All on-base housing is located mainside.
Although the majority of the mainside area of the base is located in Colts Neck, other towns that border mainside are Tinton Falls, Wall Township, Howell and Freehold. Towns near the waterfront area are Middletown and Atlantic Highlands.