Location
Like many fictional cities, the "real world" location has not been specified. In the Flash story arc Year One: Born to Run, writer Mark Waid placed Blue Valley in Nebraska. According to Mayfair Games’ The Atlas of the DC Universe (1990) Blue Valley is "situated on the northeastern edge of Nebraska, twenty-five miles southwest of Sioux Falls, South Dakota." While this distance is not plausible (Nebraska is almost 60 miles from Sioux Falls), the general location would likely be near the real-life towns of St. Helena, Nebraska and Wynot, Nebraska
In the late 1990s, Blue Valley was used by writer Geoff Johns as a backdrop for the adventures of Courtney Whitmore at the start of her career as the second Star-Spangled Kid and her adoptive father, Pat "Stripesy" Dugan in the pages of Stars and S.T.R.I.P.E. Johns narrowed down the location of Blue Valley to specify Douglas, Saunders and Lancaster Counties in JSA # 81 in 2006. This, however, would place Blue Valley near real-life Ashland, Nebraska, even farther from Sioux Falls than previously defined (about 175 miles).
Based on the rough location, city size, and the fact that the city had a college, the closet real-life representation of Blue Valley would be Wayne, Nebraska (92 miles south of Sioux Falls).
Read more about this topic: Blue Valley (comics)