The total population of Waterloo is estimated to be 244 with 132 males (54.10%) and 112 females (45.90%). There are 20 less females than males in Waterloo.
In 2022, the population of Waterloo was 149, a 1.32% decrease year-by-year from 2021. Previously, in 2021, Waterloo's population was 151, an increase of 0.67% compared to a population of 150 in 2020.
The median age in Waterloo, SC is 29.5, as per 2021 ACS 5-Year Estimates. Of the total population, 30.58% were under the age of 15, 19.42% aged 15 to 29, 30.10% aged 30 to 64, 19.90% aged 65 to 84, and 0.00% were 85 years of age and older.