Washoe Lyon county line is further North (close to the border of the city of Fernley)...

State of Nevada official boundary maps:
https://data-nevcounty.opendata.arcgis.com/datasets/county-of-nevada-boundary-with-cdn?geometry=-119.352%2C39.606%2C-119.109%2C39.652

The county line is a section line and does not Zig.

https://clearinghouse.isgs.illinois.edu/data/reference/illinois-county-boundaries-polygons-and-lines