Cornersville Trace (the town where most of these books take place) is what they call it on all the maps, and in the census forms, but the residents just call it Cornersville most of the time. It's a made-up town in the suburbs of Des Moines, Iowa (in between Urbandale and Johnston - on maps of the Des Moines metro area, the only thing between those towns is an interstate, but it this version of reality, I-80 is like the Tardis: it's bigger on the inside).
S.J. Adams, who uses Cornerville in the novel SPARKS, has more info here!
Click to view the map up close!
How to Get Suspended and Influence People (2007)
Pirates of the Retail Wasteland(2008)
Andrew North Blows Up The World (2009)
I Put a Spell On You( refers to Cornersville Trace, but takes place in Preston, about 7 miles north).
I Kissed a Zombie and I Liked It
I Don't Believe in Summer
Punk Rock Tango Girl
New York Rain
Satan's Parents' Basement
The Naked Trike Angel of Monk Hill Mall.