Form 990-PF is Return of Private Foundation or Section 4947(a)(1) Nonexempt Charitable Trust Treated as a Private Foundation. According to General Instruction G in the Instructions for Form 990-PF, a copy must be sent to the Attorney General of each state to which the foundation reports or to which it's registered.
The mailing address for the Attorney General is Office of Attorney General, Wisconsin Department of Justice, P.O. Box 7857, Madison WI 53707-7857. Their phone number is (608) 266-1221.
Filing fee to the state of Wisconsin for private foundations is $54, the federal form does not have a filing fee. The form must be filed no later than July 31st.