Welcome to the Lewis County Map Library. Lewis County GIS has constructed and maintains hundreds of map layers of land features such as roads, rivers and drainage basins, hydric soil, hydrology, topographic relief, urban growth areas, and city and district boundaries.

Select a topic on the right to begin →


Launch WebMap

This new Lewis County WebMap combines the features of the previous PATSMap & CARLMap into one application, replacing both. Learn More →

Launch FEMA WebMap

This new alternate Map includes the current FEMA flood zones and proposed FEMA floodzones. Learn More →

Recent Changes

The Board of Lewis County Commissioners have adopted the new commissioner district boundaries and the new voting precinct boundaries. To see the changes please refer to the Voting District & Service Areas page in the map library.