Nicor Inc.
                                                                       Form S-8
                                                                  Exhibit 24.01


                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ ROBERT M. BEAVERS, JR.
----------------------------
Robert M. Beavers, Jr.

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ BRUCE P. BICKNER
----------------------
Bruce P. Bickner

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ JOHN H. BIRDSALL, III
---------------------------
John H. Birdsall, III

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ THOMAS A. DONAHOE
------------------------
Thomas A. Donahoe

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ THOMAS L. FISHER
-------------------------
Thomas L. Fisher

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ KATHLEEN L. HALLORAN
--------------------------
Kathleen L. Halloran

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ JOHN E. JONES
--------------------
John E. Jones

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ DENNIS J. KELLER
------------------------
Dennis J. Keller

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ WILLIAM A. OSBORN
--------------------------
William A. Osborn

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ JOHN RAU
-------------------
John Rau

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ JOHN F. RIORDAN
-----------------------
John F. Riordan

<PAGE>

                               POWER OF ATTORNEY


The undersigned, a Director, Officer, or Director and Officer of Nicor Inc.,
an Illinois corporation, hereby authorizes any executive officer of Nicor
Inc. and each of them, to execute in the name and on behalf of the
undersigned as such Director, Officer, or Director and Officer, a
Registration Statement (and any amendments thereto) under the Securities Act
of 1933.



Date:  July 25, 2003





/s/ PATRICIA A. WIER
-------------------------
Patricia A. Wier