Hey Kirk,
Hope this helps you out, I found it under codes and maps for Houghton County.
http://www.radioreference.com/modules.php?name=RR&tab=codes&ctid=1257
HOUGHTON COUNTY IS STATION 31 WITH THE SHERIFF BEING 31-01
THE UNDER SHERIFF 31-02
PATROL OFFICERS 31-101 THRU 31-113
SGTS. 31-201 THRU 31-204. DET. 31-251
JAIL AND CORRECTIONS WORKERS 31-501 THRU 31-510.
OTHER WORKERS 31-605 THRU 31-613.
ALSO 31 TRAIL ?? FOR SNOMOBILE OR
31MARINE ?? FOR BOAT PATROL
HOUGHTON PD 31-BAKER 1 THRU 31 BAKER 11
HANCOCK PD 31-CHARLES 1 THRU 31 CHARLES 12
LAURIUM PD 31 DAVID 1 THRU 31 DAVID 8
LAKE LINDEN PD 31EDWARD 1 THRU 31 EDWARD 5
CALUMET PD 31 FRANK 1 THRU 31 FRANK 4
MICHIGAN TECH PUBLIC SAFETY 31 GEORGE 1 THRU 31 GEORGE 9
CALUMET TOWNSHIP 31HENRY 1 THRU 31 HENRY 2
AMBULANCE SERVICE IS MERCY 1 THRU MERCY 6
Houghton County Sheriffs Dept.
31 Adam 1 Sheriff
31 Adam 2 Undersheriff
31 Adam 10 Detective
31 Adam 11 thru 14 Sgts.
31 Adam 20 thru 29 Deputy's
31 Adam 50 thru 59 Corrections
31 Adam 80 thru 86 Part-time Deputy's