Marietta is a city located in Ohio. With a 2020 population of 13,780, it is the 129th largest city in Ohio and the 2448th largest city in the United States. Marietta is currently growing at a rate of 0.64% annually but its population has decreased by -2.17% since the most recent census, which recorded a population of 14,085 in 2010. Marietta reached it's highest population of 16,861 in 1970. Spanning over 9 miles, Marietta has a population density of 1,635 people per square mile.
The average household income in Marietta is $56,370 with a poverty rate of 26.62%. The median rental costs in recent years comes to $675 per month, and the median house value is $104,600. The median age in Marietta is 36.8 years, 35.4 years for males, and 38.5 years for females. For every 100 females there are 93.8 males.