Sidney is a city located in Ohio. With a 2020 population of 20,468, it is the 83rd largest city in Ohio and the 1810th largest city in the United States. Sidney is currently declining at a rate of -0.12% annually and its population has decreased by -3.58% since the most recent census, which recorded a population of 21,229 in 2010. Sidney reached it's highest population of 21,159 in 2010. Spanning over 12 miles, Sidney has a population density of 1,710 people per square mile.
The average household income in Sidney is $65,888 with a poverty rate of 14.62%. The median rental costs in recent years comes to $717 per month, and the median house value is $108,000. The median age in Sidney is 37.3 years, 36.5 years for males, and 37.8 years for females. For every 100 females there are 95.9 males.