Address to mail IRS form 940 for California?

To mail IRS Form 940 for California, send it to the address specified for your situation. If you are not making a payment, mail it to: Department of the Treasury, Internal Revenue Service, Ogden, UT 84201-0045. If you are making a payment, send it to: Internal Revenue Service, P.O. Box 932100, Louisville, KY 40293-2100. Always check the latest IRS instructions for any updates or changes to the mailing addresses.