There is a common myth that Springfield is the most common toponym in the USA. Here, I’ve used data from the Geographic Names Information System (GNIS) to debunk the myth and set the record straight. These toponyms represent populated places in the USA. Based on these data, Midway and Fairview are the most common toponyms at 217 and 211 populated places, respectively. If you are looking for a toponym that is in every state, you won’t find it, but Riverside is close (46 states), as is Centerville (43 states). Springfield is far down the popularity list at 66 populated places spread over 33 states.

Data source: http://geonames.usgs.gov/domestic/download_data.htm