Counties of the United States by date established

County ages, with Rivers

27 Feb Counties of the United States by date established

Counties by date established
Showing counties by their date of formation. In a few cases I used ‘settled’ dates. For San Francisco I used the date of the establishment of the Mission. The data is from Wikipedia. I grabbed the list of counties, then grabbed the wikipedia page for each county and pulled out the ‘Founded’ or ‘Established’ or whatever early date.

County ages NE
(And an update with Rivers and a different color scheme. It is interesting to see how County lines follow, or not, the rivers).