Data / Rankings / Population under 18 / Counties in Kentucky

Counties in Kentucky by population under 18

Todd County had the highest population under 18 of 120 counties in 2020, at 27%. Lyon County had the lowest, at 13.2%. The median was 22.9% and the figure for Kentucky was 22.7%. Source: the U.S. Census Bureau.

Highest27Todd County
Lowest13.2Lyon County
Median22.9120 counties
Kentucky22.7History

Top 40 counties, 2020

Todd County: 27 %Todd County27Grant County: 26.8 %Grant County26.8Christian County: 26.6 %Christian County26.6Oldham County: 26.4 %Oldham County26.4Boone County: 26.2 %Boone County26.2Carroll County: 25.7 %Carroll County25.7Bath County: 25.5 %Bath County25.5Hart County: 25.4 %Hart County25.4Scott County: 25.4 %Scott County25.4Whitley County: 25.1 %Whitley County25.1Jessamine County: 24.9 %Jessamine County24.9Gallatin County: 24.9 %Gallatin County24.9Nicholas County: 24.5 %Nicholas County24.5Graves County: 24.4 %Graves County24.4Meade County: 24.3 %Meade County24.3Casey County: 24.3 %Casey County24.3Ohio County: 24.3 %Ohio County24.3Hardin County: 24.3 %Hardin County24.3Daviess County: 24.2 %Daviess County24.2Wolfe County: 24.2 %Wolfe County24.2Shelby County: 24.1 %Shelby County24.1Barren County: 24.1 %Barren County24.1Lewis County: 24.1 %Lewis County24.1Butler County: 24 %Butler County24Bracken County: 24 %Bracken County24Fleming County: 24 %Fleming County24Hancock County: 24 %Hancock County24Marion County: 23.8 %Marion County23.8Owen County: 23.8 %Owen County23.8Allen County: 23.8 %Allen County23.8Knox County: 23.8 %Knox County23.8Lincoln County: 23.8 %Lincoln County23.8Logan County: 23.7 %Logan County23.7Webster County: 23.7 %Webster County23.7Spencer County: 23.7 %Spencer County23.7Kenton County: 23.7 %Kenton County23.7Montgomery County: 23.5 %Montgomery County23.5Powell County: 23.5 %Powell County23.5Lawrence County: 23.5 %Lawrence County23.5Warren County: 23.5 %Warren County23.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Todd County27+0.2 pts
2Grant County26.8+0.6 pts
3Christian County26.6+0.4 pts
4Oldham County26.4-0.3 pts
5Boone County26.2-0.2 pts
6Carroll County25.7+0.9 pts
7Bath County25.5-0 pts
8Hart County25.4-0.1 pts
9Scott County25.4-0.4 pts
10Whitley County25.1+0.8 pts
11Jessamine County24.9-0.2 pts
12Gallatin County24.9-0.4 pts
13Nicholas County24.5-0 pts
14Graves County24.4-0 pts
15Meade County24.3-0.9 pts
16Casey County24.3+0.3 pts
17Ohio County24.3-0.2 pts
18Hardin County24.30 pts
19Daviess County24.2+0.2 pts
20Wolfe County24.2+0.8 pts
21Shelby County24.1-0.2 pts
22Barren County24.1+0.1 pts
23Lewis County24.1+0.5 pts
24Butler County24+0.1 pts
25Bracken County24-0.2 pts
26Fleming County240 pts
27Hancock County24+0.1 pts
28Marion County23.8-0.2 pts
29Owen County23.8-0.4 pts
30Allen County23.80 pts
31Knox County23.8+0.6 pts
32Lincoln County23.8+0.4 pts
33Logan County23.7+0.3 pts
34Webster County23.7+0.5 pts
35Spencer County23.7-0.1 pts
36Kenton County23.7-0.3 pts
37Montgomery County23.50 pts
38Powell County23.5-0.1 pts
39Lawrence County23.5+0.6 pts
40Warren County23.50 pts
41Nelson County23.4-0.2 pts
42Pendleton County23.40 pts
43Carlisle County23.3+0.3 pts
44Laurel County23.3-0.1 pts
45Larue County23.3-0.5 pts
46Simpson County23.3-0.2 pts
47Monroe County23.3+0.1 pts
48Jackson County23.3+0.5 pts
49Metcalfe County23.2-0.2 pts
50Bourbon County23.2+0.2 pts
51Grayson County23.2+0.3 pts
52Clinton County23.2-0.3 pts
53Henry County23.2+0.5 pts
54Washington County23.1+0.2 pts
55Anderson County23.1-0.5 pts
56Breckinridge County23.1-0 pts
57Russell County23+0.2 pts
58Mason County23+0.4 pts
59Crittenden County22.9+0.5 pts
60Garrard County22.9-0.3 pts
61Henderson County22.9-0.1 pts
62McCreary County22.9+0.3 pts
63Bullitt County22.8-0.6 pts
64Harrison County22.7+0.2 pts
65Harlan County22.6+0.3 pts
66Hopkins County22.6-0 pts
67Clark County22.5+0.4 pts
68Taylor County22.5+0.1 pts
69Breathitt County22.5+0.6 pts
70McLean County22.5-0.3 pts
71Wayne County22.4-0.1 pts
72Union County22.3-1 pts
73Woodford County22.3+0.1 pts
74Pulaski County22.2-0.1 pts
75Floyd County22.2+0.4 pts
76Magoffin County22.2+0.5 pts
77Greenup County22.2+0.1 pts
78Owsley County22.1+0.6 pts
79Carter County22.1+0.2 pts
80Perry County22.1+0.3 pts
81Trigg County22.1+0.4 pts
82Mercer County22.1-0 pts
83Caldwell County22+0.2 pts
84Menifee County22-0.8 pts
85Green County21.9+0.2 pts
86Johnson County21.8-0 pts
87McCracken County21.8-0 pts
88Trimble County21.8+0.1 pts
89Jefferson County21.7-0 pts
90Clay County21.7+0.1 pts
91Bell County21.6+0.6 pts
92Estill County21.6-0.1 pts
93Letcher County21.6+0.2 pts
94Rockcastle County21.6-0.2 pts
95Cumberland County21.6+0.3 pts
96Boyd County21.5+0.4 pts
97Muhlenberg County21.5-0 pts
98Adair County21.4+0.1 pts
99Knott County21.3+0.2 pts
100Leslie County21.3-0.3 pts
101Fayette County21.2-0.1 pts
102Franklin County21.1+0.1 pts
103Campbell County21-0.1 pts
104Robertson County21-0.8 pts
105Madison County21-0 pts
106Edmonson County20.8-0.6 pts
107Pike County20.6-0 pts
108Hickman County20.6-0.7 pts
109Boyle County20.6+0.4 pts
110Ballard County20.5-0.5 pts
111Marshall County20.4-0.2 pts
112Livingston County20.3+0.2 pts
113Fulton County20.2+0.3 pts
114Morgan County19.9-0.4 pts
115Rowan County19.8+0.2 pts
116Martin County19.3-0.3 pts
117Elliott County19.1-0.7 pts
118Calloway County18.3-0.1 pts
119Lee County18.2-0.7 pts
120Lyon County13.2-0.3 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Kentucky by population under 18, 2020) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Kentucky by population under 18, 2020. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Kentucky by population under 18, 2020. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Kentucky by population under 18, 2020 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2020,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Kentucky by population under 18, 2020}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Kentucky by population under 18, 2020
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2020.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest population under 18?

Todd County, with 27% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.2% in 2020.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in Kentucky: more rankings