Unincorporated King County allows up to 8 chickens on lots under 20,000 sq ft in RA and R zones per KCC 21A.30.020, more on larger parcels. Roosters are effectively restricted via noise complaints in dense areas.
King County Code 21A.30.020 regulates keeping of small livestock. On lots under 20,000 sq ft in Rural Residential (RA) and Residential (R) zones, up to 8 small animals (chickens, ducks, rabbits) are permitted by right. Larger lots allow more based on density: 1 animal per 2,000 sq ft on 20,000-35,000 sq ft lots, and unlimited with standard setbacks on RA-2.5 or larger parcels. Coops and runs must be set back at least 10 feet from property lines and 25 feet from dwellings on adjoining properties. Roosters are not outright prohibited but must comply with KCC 12.86 noise standards, which effectively prohibits roosters in dense residential zones due to nuisance complaints. Chickens for food production are allowed; the 4-H and FFA youth livestock exceptions permit additional animals for qualifying youth projects. Keeping livestock is subject to King County Public Health rules on sanitation and King County Regional Animal Services enforcement for animal welfare.
Civil infraction under KCC 23.02. Excess livestock orders typically give 30 days to reduce count. Rooster nuisance complaints can result in removal orders and fines up to 500 dollars per day.
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