The 2014 Sidney, Ohio, population is 21,180. There are 1,762 people per square mile (population density).
The median age is 37.5. The US median is 37.2. 50.01% of people in Sidney, Ohio, are married. 16.45% are divorced.
The average household size is 2.55 people. 27.57% of people are married, with children. 21.74% have children, but are single.
92.08% of people are white, 3.50% are black, 1.01% are asian, 0.18% are native american, and 0.18% claim 'Other'.
2.27% of the people in Sidney, Ohio, claim hispanic ethnicity (meaning 97.73% are non-hispanic).