1 county-level rule, plus city-specific rules for 2 cities in St. Louis County, Missouri.
Verified from official government sources
St. Louis County Zoning Ordinance Chapter 1003 allows boundary walls or fences six (6) feet or less in height within minimum structure setback requirements in residential districts (Sec. 1003.115). No accessory building (which the code treats fences as a related structure) may exceed the primary structure's height. City limits within the county (Florissant, Kirkwood, Ferguson, etc.) set their own fence rules.
2 cities in St. Louis County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
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