The county treasurer collects the property tax and often mails the bill. The assessor is a different office, the one that set the value those mills multiply.
The county treasurer is the office that collects the property tax after the assessor has already set the value on the roll. Some places stamp that collection desk tax collector instead of treasurer. Either stamp is about payment. Neither stamp writes the assessed figure millage later multiplies.
What does a county treasurer do on a property tax bill?
California's Board of Equalization lists mailing the bill and collecting the amount due on the tax collector, and lists establishing taxable value on the assessor. Other states put that collection job in a treasurer's office. The invoice, the due date, and the receipt live on that side of the hallway. The county assessor page stays on the value desk.
Example: the assessor printed $200,000 assessed. Ten mills produce a $2,000 bill the treasurer or 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 treasurer the same as the county assessor?
No. The treasurer or collector takes the money. The assessor wrote the number. A property tax appeal is a value case, so it points at the assessor's print, 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.