The county assessor is the office that sets the taxable value on the roll. The treasurer or tax collector is the later office that mails the bill.
The county assessor is the office that locates taxable property, identifies ownership, and sets the value that goes on the roll. The treasurer or tax collector is the later office that mails the bill and takes payment. Value and collection are two jobs. Mixing them up sends a value question to the wrong desk.
What does a county assessor do?
California's Board of Equalization lists the assessor's duties as locating taxable property, identifying ownership, establishing a taxable value, applying legal exemptions, and transmitting the roll. The tax collector, on that same chart, mails the bill and collects the amount due. Other states use treasurer or collector for that second desk. The who decides assessed value page is about the yearly mass-appraisal pass; this page names the office on the notice.
Example: the assessor prints $200,000 assessed. Ten mills later turn that into a $2,000 bill the collector sends. That sequence is an example of the split, not one county's org chart.
Look up if you are overpaying.
Is the county assessor the same as the tax collector?
No. The assessor writes the value. The collector or treasurer sends the invoice. A property tax appeal is a value case, so it points at the assessor's number, not at a payment window. The property tax glossary keeps those desks labeled. FairAppeal handles the entire appeal on your behalf when a filing goes forward, and there are no upfront costs with Fair Appeal.