Select a language:

Landbase Information Systems

OC Survey’s Land Information Systems Section is where the County of Orange Landbase is maintained. This parcel-level digital basemap contains over 687,000 subdivision parcels.

The foundation of this system is the County Control Network consisting of over 2,400 control points on an approximate half-mile grid. This strong foundation makes the County Landbase very accurate and allows new map information to be added without losing any accuracy.

OC Survey’s Land Information Section maintains the OC Landbase, which is a digital basemap of Orange County containing legal parcels, districts, and transportation layers. The OC Landbase is based on information from recorded legal documents and reflects lines of ownership (“cadaster”) rather than assessor parcels. Please contact the Orange County Assessor for attribute information they collect.

To assist The County of Orange in the maintenance and/or correction of the data, users should provide the County of Orange with information concerning errors or discrepancies.

Please acknowledge the County of Orange as the source when data is used in the preparation of reports, papers, publications, maps, or other products.

The coordinate system for the OC Landbase is NAD 83, CA State Plane Zone VI, OCS 2017.5 adjustment; units are in US Survey feet.


The OC Landbase can be delivered over the Internet through our data portal, which allows content to be downloaded in Shape File format. Alternatively, the OC Landbase can be delivered in Shape File format by mail on CD/DVD disc for $10.

Delivery instructions for email and physical mail. 


Frequently Asked Questions can be found here. If you have questions that are not covered in this list provided, please feel free to send us a message.