Codes & Ordinances

The Unified Development Order (UDO) was adopted on April 2, 2008 and has been amended from time to time. The UDO is contained in Chapter 400 of the Code of Ordinances of Jefferson County.

The Official Master Plan (PDF) for Jefferson County was adopted on August 6, 2003.

Proposed Code Amendments

Notice is hereby given that the Planning and Zoning Commission of Jefferson County, Missouri, will conduct a public hearing at 6:30 p.m., Thursday, April 8, 2021 for the purpose of hearing proposed amendments to the Code of Ordinances of Jefferson County, Missouri, Chapter 400: Unified Development Order.  Due to Countywide State of Emergency, the issues surrounding COVID-19 and at-risk populations, the hearings will be conducted via ZOOM where Commission Members will participate remotely via video conference and the public is invited to watch and listen to the meeting through this link   There will be no ZOOM Public Comments due to the logistics of this video conference meeting, however Public Comments can be submitted by e-mail and they will be made part of the written record.  All comments submitted via e-mail must be submitted prior to 5:00p.m., April 2, 2021 to Elaine Roesch at