Peak To Peak Charter School Boulder County, Lafayette, Colorado
Is that a typo, or is your assertion incorrect?
From the US News & World Report page describing the Ranking Formula they used:
“We analyzed 18,790 public high schools in 40 states using data from the 2005-2006 school year.”
Charter schools are technically part of the public school system in most states.
The one school in Delaware I noticed on the list is a Charter school in Wilmington, but it is a public school even though there is criteria for entrance.
charter schools can be public. it specifically says in the article that it only considered public HSs.