Waterloo is a city located in South Carolina. With a 2020 population of 150, it is the 248th largest city in South Carolina and the 17472nd largest city in the United States. Waterloo is currently declining at a rate of 0.00% annually and its population has decreased by -9.64% since the most recent census, which recorded a population of 166 in 2010. Waterloo reached it's highest population of 150 in 2018. Spanning over 2 miles, Waterloo has a population density of 85 people per square mile.
The average household income in Waterloo is $40,831 with a poverty rate of 38.51%. The median rental costs in recent years comes to $650 per month, and the median house value is $100,000. The median age in Waterloo is 47.3 years, 38.5 years for males, and 50.7 years for females. For every 100 females there are 80.5 males.