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 →

GIS Data:

Download our commonly requested GIS data layers in ESRI shapefile format:
  • Road Centerlines
  • Tax Parcels
  • Zoning
  • Precincts
  • Voting/taxing Districts
    GIS software is needed to use the data. The files are updated weekly, either on Friday or the following Monday, to capture any changes made throughout the week.