The Planning and Zoning Division works collaboratively with developers, architects, contractors, and residents to ensure that the city's Comprehensive Plan and all applicable codes are followed. This division is also responsible for enforcing the City Code relating to signage, property maintenance, and zoning.

Staff carefully reviews all zoning submittals and provides assistance to the Board of Zoning Appeals, Design Review Board, and Planning Commission.

The City of Marysville utilizes the Union County Building Department for all building plan reviews. The Building Department assists developers, architects, contractors, and residents building or remodeling structures within the city.