Zoning Overlays & Bonuses in Jefferson County, MO (2026)
1 rule for unincorporated Jefferson County, Missouri.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Jefferson County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Density Bonus Law
Jefferson County lets single-family developers in five rural and low-density districts trade dedicated open space, parks, or public buildings for smaller minimum lot sizes and up to a 30% increase in allowed lot count.
Jefferson County Open Space Density Bonus
Some RestrictionsJefferson County UDO §§ 400.2680(A), 400.2700(C)
These standards apply to single-family developments, only in the following zoning districts: "RA-5", "LR-2", "R-40", "R-20" and "R-10". ... A lot density bonus may be available for a site based on the minimum standards in Table 7-16 through provision of a dedicated private recreation facility, dedicated public building, dedicated park, dedicated public land or restored public or private land.
All Jefferson County ordinances
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