How to Read an Assessor Parcel Map

How to Read a Map

View Assessor Parcel Maps

You can view Assessor Parcel Maps on the Marin County Assessor-Recorder-County Clerk website.

To find your parcel, use this tool:

Search Assessor Records/Maps

Please note:

These maps are for assessment use only.
The County does not guarantee the accuracy of the map data.
Some parcels may not follow local subdivision or building rules.

To view your property on the Assessor Parcel Map

To view your property on the Assessor Parcel Map, you’ll need one of the following:

your 8-digit parcel number (for example, 123-456-48), or
your Mapbook and Page number

You can find your parcel number on:

your title report
your valuation notice
your property tax bill
your deed

View the full PDF version of this image

Definition of terms found on the map

Acreage - is denotate only if larger than one acre.

Adjacent Page # - adjoining Assessor map page.

Assessor Parcel # - a number assigned to parcels of real property (or portions thereof) for tax assessment purposes.

Block # - used to subdivide a map page.

Book & Page - located on top right and bottom right of assessor parcel map.

Change Box - notes revisions made to assessor map. Includes revision date, block number, tax year, old and new assessor parcel numbers, initials of mapper, and project file number.

Easement - a defined area (land/airspace) where someone who is not the owner holds a limited amount of legal rights.

Historical Lot Line - these indicate where previous property boundary may have been located.

Lot # and Parcel # - these numbers are defined by a specific parcel map or subdivision map recorded with the County of Marin (see Record of Survey definition below).

Map Scale - is the relationship between distance on the map and distance in real life.

Record of Survey # - a reference number for a survey that has been officially recorded with the County of Marin. Their boundaries are delineated by a corner symbol marking their corners. See standard survey prefixes below:
O.S. - Official Survey
P.M. - Parcel Map (Minor Subdivision)
R.S. - Record ofSurvey
R.M. - Record Map (Major Subdivision)

Tax Rate Area - a defined area of land with the same combination of taxing districts.