Sec Form 4 Filing - NANCE ROBERT L @ MDU RESOURCES GROUP INC - 2006-06-30

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person NANCE ROBERT L 2. Issuer Name and Ticker or Trading Symbol MDU RESOURCES GROUP INC [ MDU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) MDU RESOURCES GROUP, INC., P. O. BOX 5650 3. Date of Earliest Transaction (MM/DD/YY) 06/30/2006 (Street) BISMARCK, ND58506-5650 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 46,502.514 D Common Stock 4,500 I By Ronan, Inc. Common Stock 2,184.171 I By wife

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Phantom Stock $ 0 ( 1 ) 06/30/2006( 2 ) A 296.88 ( 3 ) ( 3 ) Common Stock 296.88 $ 0 23,222.343 D Stock Option $ 10.9167 06/03/1997 06/04/2007 Common Stock 3,375 3,375 D Stock Option $ 14.4167 05/12/2000 05/13/2010 Common Stock 3,375 3,375 D Stock Option $ 15.3889 06/03/1998 06/04/2008 Common Stock 3,375 3,375 D Stock Option $ 15.5417 06/03/1999 06/04/2009 Common Stock 3,375 3,375 D Stock Option $ 19.5433 05/16/2002 05/16/2012 Common Stock 4,500 4,500 D Stock Option $ 25.7 05/17/2001 05/17/2011 Common Stock 4,500 4,500 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other NANCE ROBERT L MDU RESOURCES GROUP, INC. P. O. BOX 5650 BISMARCK, ND58506-5650 X Signatures Robert L Nance 07/03/2006 Signature of Reporting Person Date

Explanation of Responses:

( 2 )Phantom Stock units include units that were accrued through dividends under the Deferred Compensation Plan for Directors. ( 1 )1 for 1 ( 3 )Units are to be settled in cash after reporting person's retirement.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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