Assessor's Office

What the Assessor is responsible for

By law, the Assessor must:

• Find all taxable property in Marin County
• Identify the owners and describe the property
• Set the value of all taxable property
• Apply legal exemptions and exclusions
• Complete the annual assessment roll with assessed values
• Keep records for all assessed property

Taxable property includes:

• Real property (land and buildings)
• Personal property
• Business equipment and fixtures
• Manufactured homes and floating homes
• Boats and airplanes
• Possessory interests (like private use of public land)

Note: The Assessor does not set tax rates or collect taxes.

Staff at the Marin County Assessor’s Office are not allowed to give legal advice. This includes helping you choose forms or telling you how to fill them out. This rule is set by California law.

For help with real property assessments:

• Call 415-473-7215 (CA Relay use 711)

For help with business or personal property assessments:

• Call 415-473-7208 (CA Relay use 711)

Email the Assessor's Office

To reduce your wait time, you can schedule an in-person appointment using our online calendar.