The Mercer County Engineer's Office is responsible for maintaining and improving the 384 miles of County roadways and the 382 Bridges on the Mercer County local roads. The County Engineer is the Engineer for the Township Trustees in all of the Mercer County Townships and the Engineer works closely with the Townships on Township roadway maintenance and improvement.

We are a multi-faceted engineering agency covering all phases of local road and transportation development. Some of the more significant areas of our efforts consist of Survey and Design, Road Maintenance and Reconstruction, Bridge and Culvert Construction, Drainage Improvements and Snow & Ice Control.

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5 Year Capital Improvement Program-Bridges & Culverts

Township Trustee & Zoning Inspector Listing

Annual Report 2017


We welcome your comments, suggestions and questions to our office:
Mercer County Engineer
4884 Mud Pike
Celina, OH 45822
Phone # 419-586-7759
Fax # 419-586-9887
The Engineer's Office, 4884 Mud Pike, is between Fleetfoot Road and Hellwarth Road.


  • Monday thru Friday: 7:30 AM to 4:00 PM
Note: During the construction season (Apr.-Sept.) the operations employees work a 4-ten hour day schedule from 6:30 AM to 5:00 PM (Mon.-Thurs.)


  • Blackcreek
  • Butler
  • Center
  • Dublin
  • Franklin
  • Gibson
  • Granville
  • Hopewell
  • Jefferson
  • Liberty
  • Marion
  • Recovery
  • Union
  • Washington

2018 Holidays

Closing Date Day of the Week Holiday
January 1 Monday New Year's Day
January 15 Monday Martin Luther King Day
February 19 Monday Presidents' Day
May 28 Monday Memorial Day
July 4 Wednesday Independence Day
September 3 Monday Labor Day
October 8 Monday Columbus Day
November 12 Monday Veterans Day
November 22 Thursday Thanksgiving Day
November 23 Friday Thanksgiving Holiday
December 25 Tuesday Christmas