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 2021, at 27.1%. Lyon County had the lowest, at 13.9%. The median was 22.7% and the figure for Kentucky was 22.6%. Source: the U.S. Census Bureau.

Highest27.1Todd County
Lowest13.9Lyon County
Median22.7120 counties
Kentucky22.6History

Top 40 counties, 2021

Todd County: 27.1 %Todd County27.1Grant County: 26.7 %Grant County26.7Christian County: 26.5 %Christian County26.5Oldham County: 26.2 %Oldham County26.2Boone County: 25.9 %Boone County25.9Carroll County: 25.6 %Carroll County25.6Hart County: 25.3 %Hart County25.3Bath County: 25.3 %Bath County25.3Whitley County: 25.2 %Whitley County25.2Gallatin County: 25.1 %Gallatin County25.1Scott County: 25 %Scott County25Jessamine County: 24.8 %Jessamine County24.8Nicholas County: 24.6 %Nicholas County24.6Hardin County: 24.5 %Hardin County24.5Graves County: 24.5 %Graves County24.5Lewis County: 24.3 %Lewis County24.3Casey County: 24.2 %Casey County24.2Wolfe County: 24.1 %Wolfe County24.1Ohio County: 24.1 %Ohio County24.1Meade County: 24.1 %Meade County24.1Barren County: 24.1 %Barren County24.1Daviess County: 24.1 %Daviess County24.1Butler County: 24.1 %Butler County24.1Logan County: 24 %Logan County24Fleming County: 24 %Fleming County24Lincoln County: 23.9 %Lincoln County23.9Bracken County: 23.9 %Bracken County23.9Marion County: 23.7 %Marion County23.7Shelby County: 23.7 %Shelby County23.7Webster County: 23.7 %Webster County23.7Lawrence County: 23.6 %Lawrence County23.6Spencer County: 23.6 %Spencer County23.6Knox County: 23.5 %Knox County23.5Powell County: 23.5 %Powell County23.5Hancock County: 23.5 %Hancock County23.5Allen County: 23.4 %Allen County23.4Owen County: 23.4 %Owen County23.4Kenton County: 23.4 %Kenton County23.4Jackson County: 23.4 %Jackson County23.4Warren County: 23.4 %Warren County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Todd County27.1+0.1 pts
2Grant County26.7-0.1 pts
3Christian County26.5-0 pts
4Oldham County26.2-0.3 pts
5Boone County25.9-0.3 pts
6Carroll County25.6-0.2 pts
7Hart County25.3-0.1 pts
8Bath County25.3-0.2 pts
9Whitley County25.2+0.1 pts
10Gallatin County25.1+0.2 pts
11Scott County25-0.4 pts
12Jessamine County24.8-0.1 pts
13Nicholas County24.6+0.1 pts
14Hardin County24.5+0.2 pts
15Graves County24.5+0.1 pts
16Lewis County24.3+0.2 pts
17Casey County24.2-0.1 pts
18Wolfe County24.1-0.1 pts
19Ohio County24.1-0.2 pts
20Meade County24.1-0.2 pts
21Barren County24.1-0 pts
22Daviess County24.1-0.2 pts
23Butler County24.10 pts
24Logan County24+0.3 pts
25Fleming County24-0.1 pts
26Lincoln County23.9+0.2 pts
27Bracken County23.9-0.1 pts
28Marion County23.7-0.1 pts
29Shelby County23.7-0.5 pts
30Webster County23.7-0 pts
31Lawrence County23.6+0.1 pts
32Spencer County23.6-0.1 pts
33Knox County23.5-0.2 pts
34Powell County23.5-0 pts
35Hancock County23.5-0.5 pts
36Allen County23.4-0.3 pts
37Owen County23.4-0.4 pts
38Kenton County23.4-0.3 pts
39Jackson County23.4+0.1 pts
40Warren County23.4-0.1 pts
41Montgomery County23.4-0.2 pts
42Carlisle County23.40 pts
43Pendleton County23.4-0.1 pts
44Larue County23.40 pts
45Metcalfe County23.3+0.1 pts
46Nelson County23.3-0.1 pts
47Washington County23.2+0.1 pts
48Clinton County23.20 pts
49Monroe County23.2-0.1 pts
50Simpson County23.1-0.2 pts
51McCreary County23.1+0.2 pts
52Laurel County23-0.3 pts
53Anderson County23-0.1 pts
54Grayson County22.9-0.3 pts
55Breckinridge County22.9-0.2 pts
56Bourbon County22.8-0.4 pts
57Russell County22.8-0.1 pts
58Mason County22.8-0.1 pts
59Garrard County22.7-0.1 pts
60Henderson County22.7-0.1 pts
61Harrison County22.70 pts
62Hopkins County22.6+0.1 pts
63Henry County22.6-0.5 pts
64Taylor County22.6+0.1 pts
65Crittenden County22.6-0.3 pts
66Harlan County22.6-0 pts
67McLean County22.5+0.1 pts
68Union County22.4+0.1 pts
69Bullitt County22.4-0.4 pts
70Clark County22.3-0.2 pts
71Owsley County22.3+0.2 pts
72Mercer County22.2+0.2 pts
73Caldwell County22.2+0.3 pts
74Breathitt County22.2-0.2 pts
75Menifee County22.2+0.3 pts
76Wayne County22.2-0.2 pts
77Pulaski County22.2-0 pts
78Green County22.2+0.3 pts
79Floyd County22.1-0.1 pts
80Perry County22.10 pts
81Bell County22.1+0.5 pts
82Carter County22-0.1 pts
83Magoffin County22-0.2 pts
84Woodford County22-0.2 pts
85Cumberland County22+0.4 pts
86Robertson County22+1 pts
87Trigg County21.9-0.1 pts
88Greenup County21.9-0.2 pts
89Trimble County21.9+0.1 pts
90Johnson County21.7-0.1 pts
91McCracken County21.7-0.1 pts
92Jefferson County21.7-0 pts
93Muhlenberg County21.6+0.2 pts
94Rockcastle County21.60 pts
95Letcher County21.6-0 pts
96Clay County21.5-0.1 pts
97Boyd County21.50 pts
98Estill County21.3-0.3 pts
99Madison County21.3+0.3 pts
100Leslie County21.2-0.1 pts
101Livingston County21.1+0.8 pts
102Adair County21.1-0.3 pts
103Edmonson County21.1+0.2 pts
104Fayette County21.1-0.1 pts
105Knott County21-0.3 pts
106Franklin County21-0.1 pts
107Campbell County20.8-0.2 pts
108Boyle County20.7+0.1 pts
109Hickman County20.4-0.1 pts
110Pike County20.4-0.2 pts
111Ballard County20.4-0.2 pts
112Marshall County20.3-0.1 pts
113Morgan County20+0.1 pts
114Fulton County19.9-0.3 pts
115Rowan County19.6-0.2 pts
116Martin County19.5+0.2 pts
117Elliott County18.8-0.3 pts
118Calloway County18.5+0.3 pts
119Lee County18.3+0.1 pts
120Lyon County13.9+0.6 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2021.
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 27.1% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.9% in 2021.

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