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Population Projections

The population data and projections for 2020– 2050 are from Ohio Department of Development, Office of Research.

These data contain updated population projections, by age and sex, for the state of Ohio and its 88 counties, for five-year intervals through the year 2050. This projection series was produced to align the Ohio projections with the most recent population estimates issued by the U.S. Census Bureau and with the demographic changes that occurred between 2010 and 2020, and accounts for individuals in group quarters housing (such as college dormitories and correctional facilities). Please find more details at

Source: Ohio Population Projections, Ohio Department of Development, Office of Research (2022)

State- and county-level population characteristics

Many of Ohio's counties have relatively small population sizes. Over half of the counties in Ohio have fewer than 65,000 people (the threshold for single-year representative data). To have a large enough sample size to give accurate estimates at the county-level requires multiple years of data collection. The data labeled 2018-2022 is an average of data collected between January 1, 2018 and December 31, 2022. For simplicity, in the county reports, we refer to this as 2020 data, but it is actually collected during this five-year period. See the  for more details.

Please see the Ohio Development Services Agency for detailed information at