County boundaries of the U.S., web services from the National Map Service Description from metadata: The USGS governmental unit boundaries service from The National Map consists of data that represent major civil areas including States, Territories, Federal and Native American lands, counties, and incorporated places such as cities and towns. Boundaries data are useful for understanding the extent of jurisdictional or administrative areas for a wide range of applications, including managing resources and responding to natural disasters. Boundaries data also include extents of forest, grassland, park, wilderness, and wildlife areas useful for recreational activities, such as hiking and backpacking. The National Map Governmental Unit [...]
