In 2022, 34% of those aged 25+ in the US had completed bachelor’s degrees. Indiana lagged the national average at 30%. Nearby Kentucky (28%), Ohio (32%), Michigan (32%) and Illinois (38%) were near the national average. Nine east coast states (VT, NJ, CT, NH, NY, VA, DC, MD and MA) plus CO and WA exceeded 44%.

https://en.wikipedia.org/wiki/List_of_U.S._states_and_territories_by_educational_attainment

The Census Bureau provided a nice interactive map to display county level data from the American Community Survey for 2015-19. They used 40% as the cut-off for the very highest educated counties.

https://www.census.gov/library/visualizations/interactive/acs-percentage-bachelors-degree-2015-2019.html

Focusing on Indiana and its 4 adjacent states, there were just 15 counties with 40%+ bachelor’s degree completion rates among the 485 counties (3%). Hamilton County was in first place at 56%, tied with suburban Detroit’s Washtenaw County. Columbus suburb Delaware County was in third place at 54%. Suburban Chicago’s DuPage County and Indy’s Boone County tied for fourth place at 49%. Detroit’s Oakland County (47%) claimed sixth place, while Indiana’s Monroe County (46%) snagged seventh place. Franklin and Warren counties in Ohio, Leelanau County in Michigan, Champaign, McLean and Lake counties in Illinois, and Oldham and Fayette counties in Kentucky earned honorable mention.

Hamilton County ranked in 16th place overall (99.5 percentile) among all 3,100 counties nationally.

‘https://247wallst.com/special-report/2021/09/03/most-educated-counties-in-the-united-states/

Of the top 20 counties, 5 had populations below 25,000. The greater DC/Baltimore area claimed 7 of the top spots: Arlington, Alexandria, Howard, Fairfax, Loudon, Montgomery and DC. Denver suburban Boulder and Douglas counties won two places. New York and San Francisco placed in the top 20. Marin, CA, Williamson, TN and Orange, NC claimed the other 3 top spots.

Hamilton County is in very fine company. It’s bachelor’s degree percentage increased from 56% in the 2015-19 average to 61% in the 2017-21 average.