If you're using TurboTax Online, try closing the program, clearing your Cache and Cookies, then revisit your California state return.
Once you choose your county from the dropdown list, it should stick. Make sure you didn't choose 'Non-Resident' as your status, in which case you can't choose a County of Residence.
Since we can't see your return in this forum, if this doesn't resolve your issue, you can Contact TurboTax Help.
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