Seneca is a city located in South Carolina. With a 2020 population of 8,655, it is the 44th largest city in South Carolina and the 3398th largest city in the United States. Seneca is currently growing at a rate of 1.03% annually and its population has increased by 6.83% since the most recent census, which recorded a population of 8,102 in 2010. Spanning over 8 miles, Seneca has a population density of 1,100 people per square mile.
The average household income in Seneca is $54,658 with a poverty rate of 19.69%. The median rental costs in recent years comes to $628 per month, and the median house value is $166,200. The median age in Seneca is 43.9 years, 40.3 years for males, and 46.5 years for females. For every 100 females there are 83.0 males.