General contact information may be found on MnDOT's web site here or you may contact the district offices directly:
MnDOT District 6A - Rochester Office
2900 48th St NW
Rochester, MN 55901
507-286-7500
MnDOT District 6B - Owatonna Office
1010 21st Ave NW
Owatonna, MN 55060
507-446-5550
MnDOT's Official Web site
www.dot.state.mn.us