This may be because cityquiz.io encourages you to find all the capitals with acheviements, but the thing is that they also encourage to find the biggest cities, so it's hard to say if it bias it...
The stats of Wichita are actually boosted because it is more or less given as an example in cityquiz.io... But even with this help, it's still "only" the 25th most guessed city up there haha
Where did you get this data? I've been using CityQuiz for years and I haven't seen a comprehensive list of which cities are guessed most, just a small window showing least known cities.
If you play on "any state" mode (default mode and recommended one), you will only get the biggest city that is named Portland. Else there surely are more than 2 Portland as well as other cities of this quiz in the whole USA!
I think i'm gonna create other quizzes like this one in the next weeks
This may be because cityquiz.io encourages you to find all the capitals with acheviements, but the thing is that they also encourage to find the biggest cities, so it's hard to say if it bias it...
Most of my American geography comes from the Grateful Dead (Wichita is fun to say.)
I did expect to see Scranton on here though.