750 ILCS 75/45
Any person who enters into a civil union in Illinois consents to the jurisdiction of the courts of Illinois for the purpose of any action relating to a civil union even if one or both parties cease to reside in this State. A court shall enter a judgment of dissolution of a civil union if at the time the action is commenced it meets the grounds for dissolution set forth in Section 401 of the Illinois Marriage and Dissolution of Marriage Act. The provisions of Sections 401 through 413 of the Illinois Marriage and Dissolution of Marriage Act shall apply to a dissolution of a civil union. The provisions of Sections 301 through 306 of the Illinois Marriage and Dissolution of Marriage Act shall apply to the declaration of invalidity of a civil union.
750 ILCS 75/45