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Assessor

Public Information
Current information about property ownership and assessment in Tuolumne County is available for viewing, without charge, at our office at:
2 S. Green St.
Sonora, CA 95370

Assessor Parcel Maps
The Assessor’s Office also maintains maps of every parcel of property in our county. These maps are continuously being updated to reflect new parcels and changes to existing parcels. Assessor maps are also available for viewing, without charge, at our office.

All assessor's parcel maps are now available online. The Property Search Tool allows you to view and print the current assessor parcel map and some limited assessment data. The tool allows you to search by either assessor's parcel number (APN) or by street address. Some parcels, such as vacant land, have not been assigned street addresses, and an APN will be necessary to perform a search.

Hard copies of assessor maps, property characteristic profiles, and copies of assessment roll information are also available for purchase at our office. Please see the Assessor Fee Schedule for pricing.

Functions of the Assessor
The Assessor must discover and inventory all taxable real and personal property in the county and determine a fair and equitable value to be enrolled on the annual assessment roll. These functions are largely dictated by the:

  • California Constitution
  • Revenue and Taxation Code
  • State Board of Equalization

In order to complete the annual assessment roll, the Assessor must perform the following tasks each year:

  • Complete all mapping duties and assignment of parcel numbers
  • Maintain the integrity of the mandatory audit program by keeping up with the statutory requirement to audit all businesses that have a value of more than $400,000 on a rotational four-year basis
  • Process all exemption claims, including homeowners, veterans, welfare, church, and religious
  • Process all mining claim, boat, aircraft, and business property statements
  • Process all real property transfers and building permits that require reassessment
  • Process a variety of claim forms for state and county mandated programs such as the Williamson Act, disaster relief, parent / child exclusions, and base year value transfers

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