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Layman's version: May have up to 3 domestic fowl.
The Urban Chicken ordinance on the books:
Link to municipal code online: Seattle Municipal Code SMC 23.42.052 Keeping of Animals.
Text of municipal code
Title 23 - LAND USE CODE
Subtitle III Land Use Regulations
Division 2 Authorized Uses andDevelopment Standards
Chapter 23.42 - General Use Provisions
SMC 23.42.052 Keeping of Animals.
The keeping of small animals, farm animals, domestic fowl and bees is
permitted outright in all zones as an accessory use to any principal
use permitted outright or to a permitted conditional use, in each case
subject to the standards of this Section.
A. Small Animals. Up to three (3) small animals may be kept accessory
to each business establishment or dwelling unit on a lot, except as
1. In no case is more than one (1) miniature potbelly pig allowed per
business establishment or dwelling unit (see subsection B of this
2. In single-family zones,
a. accessory dwelling units shall not be considered separate dwelling
units for the purpose of this section;
b. up to four (4) small animals are permitted on lots of at least
twenty thousand (20,000) square feet; and
c. one (1) additional small animal is permitted for each five thousand
(5,000) square feet of lot area in excess of twenty thousand (20,000)
square feet. Accessory structures, including kennels, for four (4) or
more animals must be at least ten (10) feet from any other lot in a
C. Domestic Fowl. Up to three (3) domestic fowl may be kept on any lot
in addition to the small animals permitted in subsection A. For each
one thousand (1,000) square feet of lot area in excess of the minimum
lot area required for the zone or, if there is no minimum lot area,
for each one thousand (1,000) square feet of lot area in excess of
five thousand (5,000) square feet, one (1) additional domestic fowl
may be kept.