Hydro is a city located in Oklahoma. With a 2020 population of 921, it is the 229th largest city in Oklahoma and the 10664th largest city in the United States. Hydro is currently declining at a rate of -1.07% annually and its population has decreased by -4.95% since the most recent census, which recorded a population of 969 in 2010. Hydro reached it's highest population of 972 in 2010. Spanning over 1 miles, Hydro has a population density of 1,373 people per square mile.
The average household income in Hydro is $63,193 with a poverty rate of 12.25%. The median rental costs in recent years comes to $719 per month, and the median house value is $90,500. The median age in Hydro is 36.1 years, 36 years for males, and 36.1 years for females. For every 100 females there are 95.7 males.