The trek into having chickens has become more informative. For the City of Portland, a permit for chickens is only required if you have 4 or more chickens. It is suggested that you follow the guidelines for having 4 or more chickens even if you have less, just in case you want to have more later. Plan ahead, in other words!
The City of Portland decides the code and Multnomah County enforces the code. The basic requirements are that the coop’s outer reaches (the chicken’s enclosure) is not less than 15 feet from your neighbors home. Although the requirement is quite flexible, it is suggested that you keep the coop on your property and contact all neighbors within 200 feet of the chicken enclosure. Keep the odors under control, and don’t feed the chickens things that will attract rats.
For more information, check out the following links: