Keansburg, NJ, is a town along the Raritan Bay in Monmouth County, NJ. Homes are highly affordable here, as well as investment properties. While there are stigmas regarding Keansburg, it has a lot of positives. You can find many restaurants and pubs within town. And if you're into amusement parks, Keansburg Amusement Park is right along the water on Beachway Ave.