US counties with the biggest high-school attainment gains since 1990

The college-degree story gets most of the attention, but the high-school-completion story is where the most dramatic 1990-to-today gains are. The counties at the bottom of the 1990 high-school distribution have closed enormous ground, often because their oldest cohorts (who never finished high school) have aged out and been replaced by adults who did. The 25 US counties with the largest absolute gains in high-school attainment since 1990 are below.

Grainger County, Tennessee leads at +39.6%, climbing from 46.3% in 1990 to 85.9% today.

#	Place	1990	Latest	Change
1	Grainger County, Tennessee	46.3%	85.9%	+39.6%
2	Grayson County, Kentucky	48.3%	85.3%	+37.0%
3	Jasper County, South Carolina	54.5%	91.1%	+36.6%
4	Fayette County, Tennessee	55.5%	91.7%	+36.2%
5	Campbell County, Tennessee	47.5%	83.5%	+36.0%
6	Carroll County, Virginia	49.7%	85.5%	+35.7%
7	Monroe County, Tennessee	49.9%	85.6%	+35.6%
8	Gilmer County, Georgia	52.3%	87.2%	+34.8%
9	Cocke County, Tennessee	50.4%	84.9%	+34.5%
10	Jackson County, Georgia	54.5%	88.7%	+34.1%
11	Dyer County, Tennessee	55.3%	89.3%	+34.0%
12	Carroll County, Tennessee	55.3%	89.2%	+33.9%
13	Fayette County, Texas	57.6%	91.5%	+33.9%
14	Macon County, Tennessee	49.2%	82.8%	+33.6%
15	Smyth County, Virginia	53.3%	86.8%	+33.5%
16	Henderson County, Tennessee	55.2%	88.6%	+33.5%
17	Ashe County, North Carolina	55.6%	88.7%	+33.2%
18	Pickens County, Georgia	56.8%	89.9%	+33.1%
19	Claiborne County, Tennessee	50.8%	83.8%	+33.0%
20	Carter County, Kentucky	51.3%	84.2%	+33.0%
21	Hoke County, North Carolina	55.7%	88.7%	+33.0%
22	Marion County, Alabama	50.0%	83.0%	+32.9%
23	Perry County, Kentucky	47.6%	80.4%	+32.8%
24	Fannin County, Georgia	55.8%	88.6%	+32.8%
25	Lawrence County, Tennessee	53.7%	86.5%	+32.8%

Key findings

• Grainger County, Tennessee leads the list at +39.6%.
• The 25th-ranked county on this list — Lawrence County, Tennessee — shows +32.8%.
• Across the full universe of 1611 county rows with both data points, the typical change was +17.0%.
• The top gainers concentrate in Tennessee (11 of the top 25), Georgia (4 of the top 25), Kentucky (3 of the top 25).

Where the pattern sits geographically

Tennessee (11 of the top 25), Georgia (4 of the top 25), Kentucky (3 of the top 25) together account for the bulk of the top of this list. Click any county above to open its CensusEasy page, which carries the full historical time series for every metric we publish (income, education, housing, commute, race composition, industry mix), plus its rank within its state and its national percentile on each metric.

How to read this

This ranking is sorted by absolute change, not by percentage change. Absolute change is the figure that lines up with how readers experience these numbers in everyday life ("the typical household here earns $X more than in 1990"). The percentage-change framing surfaces a different set of county rows — usually places that started from a low base — and we publish those rankings separately on the rankings pages.

A single metric never tells the whole story. The smallest gain on this list can reflect either change in the same population staying in place, or compositional change as some residents leave and others arrive. Companion studies on poverty, education, and housing cost together describe the fuller picture.

This is a leveling-up story: every county on this list now has a much higher share of adults with a high-school credential than it did in 1990. The bachelor's-degree distribution has not converged in the same way.