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:
At its meeting on March 27, 2023, the Jefferson County, Missouri, Council approved amendments to the UDO.