According to the Center for Disease Control and Prevention (CDC) chlamydia is the most common bacterial sexually transmitted disease (STD) in the U.S.  largely affecting men and women between the ages of 20 to 24. If untreated chlamydia can cause detrimental damage to a women’s reproductive system. 
Check out this map which shows the incidence of chlamydia by US counties in 2013 per 100,000 population. From the map, we can see most of states have a couple counties that are shaded dark indicating a high rate of newly diagnosed cases. Overall, we can see most counties have newly diagnosed causes of chlamydia.
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By Julia Watson