Quick Answer
Most US municipal systems use free chlorine; EPA and industry sources indicate chloramine is used by roughly a quarter of larger water systems, more common in big metropolitan areas. The only authoritative answer for your address is your utility's annual Consumer Confidence Report — the disinfectant is listed there.
Problem
Filter buyers assume 'chlorine' covers their city, but chloramine areas need different media. Knowing which one you have changes the filter you should buy.
Product Recommendation
Once you know your disinfectant, media selection is straightforward. ZOOSHEN publishes the media in each system. See /water-science/chlorine-vs-chloramine and /technical/chloramine.