Where is scarlet fever found most in the united states?

Throughout the US. Scarlet fever is found throughout the US. It is caused by group A streptococcus, found on the noses and throat of people. It is most commonly found in children ages 5-15 years. The classic symptom of scarlet fever is a sandpaper like rash. More about scarlet fever: https://www.cdc.gov/features/scarletfever/