You must apply with the CLEO of your primary residence, aka your domicile. Your domicile is what YOU consider your current permanent residence for the foreseeable future. Informally, it is the place you consider your home. What are the indicia of domicile? In no particular order: where you're registered to vote; the location you use for tax purposes; where your car registration is sent; what your drivers license list; where your bank statements are mailed; etc. The amount of time you spend there is not determinative. A student away at college may still have his parent's residence as his domicile.
BUT, regardless of the law, some sheriffs specify that you must live in their county full-time, or even most of the time (>50%). IIRC, that is an illegal requirement, but since when has breaking the law ever stopped an CA anti sheriff....

Of course, NONE of my musings are to be considered LEGAL ADVICE. If you plan on pursuing the course of action of your inquiry, I STRONGLY SUGGEST you contact a lawyer licensed in CA, and esp one who specializes in firearms law, for legal counsel.
That's another reason (#3) I get so ticked at our CCW law in CA: corrupt sheriffs who LIE by saying they'll be sued if someone they issue a CCW to commits a crime with it. They KNOW they have immunity, yet they've used that LIE for years to get out of readily issuing CCWs. Similarly, some anti sheriffs say the law REQUIRES them to require of applicants more than a mere desire to carry for "self-defense"/"personal protection" as a GC statement. Again, that is a LIE these so-called "chief law-enforcement officers of the county" knowingly tell Americans. These anti sheriffs are mere "politicians with guns & badges" only believe in obeying the law when it suits them. They are little better than corrupt, 3rd world tyrants who care not a wit about their oaths of office or the Constitution. Yes, I am sickened at the games anti sheriffs play with our rights, our laws, and our personal safety. They wrap themselves in the flag when running for office and then use it to wipe their ---es once in office.

If Californians were as soundly grounded in Constitutional theory as our Forefathers, we would be heating up tar & gathering up feathers....
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