4 county-level rules, plus city-specific rules for 2 cities in St. Louis County, Missouri.
Verified from official government sources
Residents in unincorporated St. Louis County may keep chickens as pets but may not breed them for sale or sell eggs. Chickens must not become a public nuisance under SLCRO §611.210. Each incorporated city sets its own poultry rules.
St. Louis County Code §611.210
Sec. 611.210. — A dog, cat, puppy, or kitten or any other animal creates a nuisance if it: … Causes unsanitary or dangerous conditions … Causes a disturbance by excessive barking, howling, meowing, or other noisemaking …
SLCRO §611.200 prohibits dogs, cats, puppies, and kittens from being at large anywhere in St. Louis County. Pets must be on a leash, in a cage or building, in a car, or on the owner's property at all times — this applies countywide, including all 88 municipalities.
St. Louis County Code §611.200
Sec. 611.200. — Dogs, Cats and Other Animals at Large — Prohibited. If a dog, puppy, cat, or kitten is not in a cage or building, it must be on a leash, in a car, or on the property of its owner.
SLCRO §611.210 declares any animal that defaces public property, causes unsanitary conditions, or attracts pests a public nuisance. Stagnant water collecting on private property is itself a §602.050 nuisance because of mosquito breeding.
St. Louis County Code §611.210
Sec. 611.210. … Tips, rummages through, or damages a refuse container … Impedes refuse collection, mail delivery, meter reading or other public service activities by annoying persons responsible for such activities …
In unincorporated St. Louis County, a single-family residence may keep at most 3 dogs, OR 5 cats, OR a combination of 5 dogs and cats with no more than 3 dogs at any time.
St. Louis County Ordinance Guidebook — Animals, Maximum Number of Pets
The maximum number of dogs and cats permitted per single-family residence in unincorporated St. Louis County is three (3) dogs or five (5) cats or a combination of five (5) dogs and cats with no more than three (3) dogs at any time.
2 cities in St. Louis County have their own animal ordinances rules. Each link goes to that city's dedicated page with code citations.
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