1 county-level rule, plus city-specific rules for 2 cities in St. Louis County, Missouri.
Verified from official government sources
St. Louis County Chapter 625 (Noise Control Code) governs noise in unincorporated areas. The code restricts lawn-care maintenance equipment to operation from 7:00 a.m. prevailing local time to sunset (when fitted with original-equivalent sound control devices). State law RSMo 574.010 (peace disturbance) backstops loud noise that knowingly disturbs another. Each of the 88+ municipalities in the county (Florissant, Kirkwood, Ferguson, etc.) sets its own quiet hours.
2 cities in St. Louis County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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