Seneca is a city located in Missouri. With a 2020 population of 2,404, it is the 213th largest city in Missouri and the 6949th largest city in the United States. Seneca is currently growing at a rate of 0.38% annually and its population has increased by 2.91% since the most recent census, which recorded a population of 2,336 in 2010. Spanning over 3 miles, Seneca has a population density of 939 people per square mile.
The average household income in Seneca is $45,387 with a poverty rate of 21.17%. The median rental costs in recent years comes to $652 per month, and the median house value is $85,000. The median age in Seneca is 33.6 years, 31.4 years for males, and 41.4 years for females. For every 100 females there are 99.4 males.