Yes, I really did keep track of every location in every episode and calculate the mileage.
Some locations are completely unknown, and therefore not plotted on the map. If I knew the state, but not the location within the state, I used the city closest to the geographic center of the state.
Note: this is just where the Impala went. That’s why Season 7 is so short (because remember how they weren’t in the Impala for most of season 7?) and it doesn’t show their trip to Scotland in season 6.
Click through to the source link to embiggen.
EDIT: Since dimwits won’t stop commenting on it: I know they didn’t drive over the Gulf of Mexico. All of the mileage is based on a trip calculator. The lines are for visual effect only and are OBVIOUSLY NOT DRIVING ROUTES.
ANOTHER EDIT: I have made new maps! They are better than this one! Please check them out!