The states that might support the New Jersey Plan, based on historical context, were primarily the smaller states that feared losing power to the larger states under the Virginia Plan. Specifically, New Jersey, New York, and Delaware are known to have supported the New Jersey Plan. Connecticut initially supported it as well, and one delegate from Maryland, Luther Martin, supported it. These states wanted equal representation with one vote per state in a unicameral legislature rather than representation based on population size, which disproportionately favored larger states.
In the Constitutional Convention vote, these three states voted for the New Jersey Plan. The plan was intended to protect smaller states' powers in the new government structure.
Therefore, any state today with interests aligned to equal representation regardless of population size might be inclined to support a modern equivalent of the New Jersey Plan. Historically, that includes the smaller states of New Jersey, New York, Delaware, Connecticut (initially), and some representation from Maryland.
