Geographic Information Systems

Welcome to Geographic Information Systems (GIS)

The GIS Division supports and maintains the County's geographic base map. This division provides mapping and analysis support for County departments, outside agencies and the public. GIS is the public's portal to geographically referenced data for all County departments, with links to other county systems.
Open the My Neighborhood app

My Neighborhood

With the "MyNeighborhood" map you can obtain property-based data such as address, valuation, and districting. Also find aerial photos, your favorite trail, and much more.
Launch the Open Data Portal

Open Data Portal

This is our public platform for exploring, filtering, and downloading GIS data. A great place to start if you want to make your own map!
View the PDF Maps page

PDF Maps

Our most requested maps are available in a large page PDF format and require Adobe Acrobat Reader or a similar program for viewing.
Open the Map Gallery

Map Gallery

The Map Gallery provides you with features all of our web applications as well as specific purpose web maps.
Open the FAQ

Frequently Asked Questions

Find answers to Geographic Information System's most frequently asked questions.