The MDU Resources Group (NYSE: MDU) board of directors today declared quarterly dividends on the company’s common and preferred stock.

The dividend for common stock is 14.5 cents per share, unchanged from the previous quarter. Dividends for preferred stock are:

• $1.12-1/2 per share on 4.50 percent Series Preferred
• $1.17-1/2 per share on 4.70 percent Series Preferred
• $1.27-1/2 per share on 5.10 percent Series Preferred

The dividends are payable July 1, 2008, to stockholders of record June 12, 2008.MDU Resources Group, Inc., a member of the S&P MidCap 400 index, provides value-added natural resource products and related services that are essential to energy and transportation infrastructure, operating in three core lines of business:  Energy, Construction Materials and Utility Resources. MDU Resources includes natural gas and oil production, natural gas pipelines and energy services, construction materials and contracting, construction services, and electric and natural gas utilities. For more information about MDU Resources, see the company’s Web site at www.mdu.com.

Contacts:

   Investor Relations:  
     Phyllis A. Rittenbach
     Director of Investor Relations
     (701) 530-1057

   Media:
     Rick Matteson
     Director of Communications and Public Affairs
     (701) 530-1700