If you live in Phillipsburg or any township in Warren county, library cards are free. You just have to provide a valid form of ID. If you live anywhere else, you have to buy an annual membership. I believe it is $70 for a family.
Not if you live in Phillipsburg. If you live out of town, I don't believe you can become a member, but could join the county library.
Thanks! Your answer is awaiting moderation.