Text Size:   A+ A- A   •   Text Only
Site Image
Cartography and maps

Our Cadastral Information Systems Unit (CISU) establishes and maintains statewide cadastral mapping standards. The unit also assists in the preparation and maintenance of individual assessor's maps. The unit achieves this by assisting nine of the 36 Oregon counties with their daily map maintenance.

CISU also has a statutory responsibility to approve taxing district
annexations (ORS 308.225), and assists in the assessment of centrally assessed properties through processing Property Classification Memorandums (PCMs).

Map maintenance
CISU is currently responsible for maintaining and updating taxlot maps for the nine counties that have no cartographic staff. The majority of maintenance work consists of adding partition plats, new subdivisions, and property line adjustments to the existing maps. The nine counties that currently have their maps maintained by CISU are Baker, Curry, Grant, Hood River, Morrow, Malheur, Sherman, Union, and Wallowa. Questions regarding county properties should be directed to the county offices.

Digital remapping
The purpose of remapping is to convert the various county paper tax lot maps into a digital format to be used in a Geographic Information System (GIS), and to bring the accuracy of these maps within national standards. These projects create seamless tax lot maps for each county which are of the highest quality. Try this link to find out more about remapping in Oregon and to search the ORmap online database for maps and tax lot information

Property Classification Memorandums (PCM) CISU assists with the maintenance of Property Classification Memorandums (see Utility Property). A PCM lets the county assessor know whether a property is centrally assessed by the department under ORS 308.515 (for example: railroads, pipelines, and power companies) or is locally assessed by the county assessor. A PCM contains a legal description and map of the property along with ownership and property status information. The Utility Team determines whether a property is centrally assessed or locally assessed. CISU reviews the legal descriptions, outlines the maps, and creates the PCM. 
Boundary changes Taxing district boundary changes occur when property is incorporated into or removed from a taxing district or districts. This often occurs when county property agrees to be annexed into a city. This process also includes withdrawals, transfers from one district to another, and formations of new districts. Taxing districts include cities, rural fire districts, lighting districts, library districts, and many others. Our role in the boundary change process began in 1975 with ORS 308.225. The 1,750 or so taxing districts within Oregon are required to file a map, legal description, and approved resolution of the annexed property, with the CIS Unit (and the county assessor) by March 31 for that ensuing fiscal year. CISU checks the maps, descriptions, and ordinances for compliance and accuracy. Once the annexations are approved by CISU, notice is sent to the county assessor who then adds the property to the appropriate taxing district.

For more information

Frequently asked questions about boundary changes
Boundary changes overview publication
Oregon cadastral map system "manual"
Notice from taxing districts
Email us with questions