Kishy, are you an American? If so, what state or region of the country are you from? Just to get an idea of what you have been “used to” in the US.
In SD County, I would recommend Valley Center (92082) for you. You will find your acreage there where you will likely be able to keep poultry. Just an FYI that most (or all) of the lots you are looking for will be on septic.
However, based upon your posts, I really feel NorCal is a better fit for you and your family for many reasons, not the least of which is “culture.” If I were you, I would consider the following counties to raise my children in on at least one AC (perhaps larger) and also raise chickens. Sonoma, Napa, Lake, Mendocino (eastern), Humboldt, Trinity, Shasta, Tehama, Glenn, Colusa and Yolo, with the first four counties most preferable.
Also (eastern) Santa Barbara County (central CA) as another poster mentioned.
And why did you decide to pass on Boulder? Did you consider towns west of there such as Nederland? And are you aware that there are several towns in Boulder County where a homeowner can raise chickens? That area offers a tremendous quality of life, IMHO, especially for “transplants” who have the means to enjoy all the varied activities it has to offer :=]
