Probably. There are a number of tasks involved with forming a nonprofit organization at the state level. The most important of these is the incorporation process. While it is possible to form a non-corporate, nonprofit organization, (and obtain federal 501(c) tax exemption), the vast majority of organizations choose corporate status.
Forming a corporation means that the founders, or incorporators, are creating a legal entity that exists wholly apart from the people involved with it. Most people prefer to form a nonprofit corporation, in part, because of the liability protection a corporation provides. For example, if a nonprofit corporation were to be sued, the assets of its directors and members are generally protected because corporate assets are distinct from personal assets.