That Vacaville code isn't the problem, it is this one:
14.09.077.050 Special District Provisions.
The following special district provisions shall apply to the following uses:
A. The raising of poultry, rabbits, and other small animals for non-commercial purposes on a site at least one acre in area, as follows:
1. There shall be at least 1,000 square feet of site area for each fowl or animal;
2. No structure housing poultry or other small animals shall be closer than 50 feet to a dwelling on the site or to a property line;
3. The minimum site area requirements shall not apply for the raising of small animals when in conjunction with a 4-H or similar type project.
I am launching an online pro-backyard chicken keeping ordinance petition. Please support the petition drive by signing and posting widely if you would like Vacaville City Council to change the law to allow owners of lots less than one acre in size to keep small backyard flocks - signatures are especially powerful if from current Vacaville residents:
http://www.change.org/petitions/cit...low-vacaville-residents-to-raise-chickens-now
im not from USA but i signed your petition for ya
good luck