UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 April 27, 2004 Date of Report (Date of earliest event reported) NICOR INC. (Exact name of registrant as specified in its charter) Illinois 1-7297 36-2855175 (State or other jurisdiction (Commission (I.R.S. Employer of incorporation) File Number) Identification Number) 1844 Ferry Road Naperville, Illinois 60563-9600 (Address of principal executive offices) (Zip Code) (630) 305-9500 (Registrant's telephone number, including area code) Page 1 Item 5. Other Events and Regulation FD Disclosure The following is filed as an exhibit to this report. Exhibit Number Description 99.1 Press release of Nicor Inc. issued April 27, 2004. Page 2 Signature Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Nicor Inc. Date April 27, 2004 /s/ JEFFREY L. METZ ------------------------ ------------------------------------ Jeffrey L. Metz Vice President and Controller Page 3 Exhibit Index Exhibit Number Description of Document 99.1 Press release of Nicor Inc. issued April 27, 2004.