Arenzville is a city located in Cass County Illinois. With a 2020 population of 357, it is the 968th largest city in Illinois and the 14689th largest city in the United States . Arenzville is currently declining at a rate of -1.38% annually and its population has decreased by -12.71% since the most recent census, which recorded a population of 409 in 2010. Arenzville reached it's highest population of in . Spanning over 1 miles, Arenzville has a population density of 465 people per square mile.
The average household income in Arenzville is $83,288 with a poverty rate of 3.23%. The median rental costs in recent years comes to $575 per month, and the median house value is $93,700. The median age in Arenzville is 38.2 years, 38.8 years for males, and 37.1 years for females.