Central Falls, Rhode Island. The 27th most densely populated city in America. Approximately 20,000 people living in little more than 1 square mile. Recently, we’ve all learned more about Central Falls as it became a hotspot for COVID-19 transmission. Dense housing, with streets of 3-tenement houses and multi-generational family living, made the transmission of a … Continue reading 9 more tanks. 390,000+ gallons of used oil. A pond to Narragansett Bay. One of the most densely populated cities in America. What could go wrong? (updated)