<SEC-DOCUMENT>0000067716-17-000068-index.html : 20170818
<SEC-HEADER>0000067716-17-000068.hdr.sgml : 20170818
<ACCEPTANCE-DATETIME>20170818101453
ACCESSION NUMBER:		0000067716-17-000068
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20170818
DATE AS OF CHANGE:		20170818
EFFECTIVENESS DATE:		20170818

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDU RESOURCES GROUP INC
		CENTRAL INDEX KEY:			0000067716
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				410423660
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-220026
		FILM NUMBER:		171040289

	BUSINESS ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503
		BUSINESS PHONE:		701-530-1059

	MAIL ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MONTANA DAKOTA UTILITIES CO
		DATE OF NAME CHANGE:	19850429
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3ASR
<SEQUENCE>1
<FILENAME>forms-3asr.htm
<DESCRIPTION>S-3ASR
<TEXT>
Document 1 - file: forms-3asr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5
<SEQUENCE>2
<FILENAME>exhibit51perkinscoieopinion.htm
<DESCRIPTION>EXHIBIT 5
<TEXT>
Document 2 - file: exhibit51perkinscoieopinion.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-12
<SEQUENCE>3
<FILENAME>a2017ex12s-3.htm
<DESCRIPTION>EXHIBIT 12
<TEXT>
Document 3 - file: a2017ex12s-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.(A)
<SEQUENCE>4
<FILENAME>dtconsent23a.htm
<DESCRIPTION>EXHIBIT 23.(A)
<TEXT>
Document 4 - file: dtconsent23a.htm

</DOCUMENT>
</SEC-DOCUMENT>