Data / Rankings / Population under 18 / Counties in Kentucky

Counties in Kentucky by population under 18

Christian County had the highest population under 18 of 120 counties in 2024, at 27.9%. Lyon County had the lowest, at 13.9%. The median was 22.4% and the figure for Kentucky was 22.3%. Source: the U.S. Census Bureau.

Highest27.9Christian County
Lowest13.9Lyon County
Median22.4120 counties
Kentucky22.3History

Top 40 counties, 2024

Christian County: 27.9 %Christian County27.9Todd County: 27.1 %Todd County27.1Grant County: 26 %Grant County26Carroll County: 25.8 %Carroll County25.8Bath County: 25.3 %Bath County25.3Boone County: 25 %Boone County25Whitley County: 24.9 %Whitley County24.9Nicholas County: 24.8 %Nicholas County24.8Hart County: 24.7 %Hart County24.7Oldham County: 24.5 %Oldham County24.5Webster County: 24.4 %Webster County24.4Fleming County: 24.4 %Fleming County24.4Graves County: 24.2 %Graves County24.2Scott County: 24.1 %Scott County24.1Hardin County: 24.1 %Hardin County24.1Barren County: 24 %Barren County24Jessamine County: 24 %Jessamine County24Butler County: 24 %Butler County24Logan County: 23.9 %Logan County23.9Daviess County: 23.8 %Daviess County23.8Lincoln County: 23.8 %Lincoln County23.8Casey County: 23.6 %Casey County23.6Lewis County: 23.6 %Lewis County23.6Gallatin County: 23.6 %Gallatin County23.6Carlisle County: 23.5 %Carlisle County23.5Monroe County: 23.5 %Monroe County23.5Wolfe County: 23.5 %Wolfe County23.5Jackson County: 23.4 %Jackson County23.4Warren County: 23.4 %Warren County23.4Grayson County: 23.3 %Grayson County23.3Allen County: 23.3 %Allen County23.3Bracken County: 23.3 %Bracken County23.3Knox County: 23.3 %Knox County23.3Simpson County: 23.2 %Simpson County23.2Montgomery County: 23.2 %Montgomery County23.2Taylor County: 23.1 %Taylor County23.1Metcalfe County: 23.1 %Metcalfe County23.1Spencer County: 23 %Spencer County23Lawrence County: 23 %Lawrence County23Washington County: 23 %Washington County23
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Christian County27.90 pts
2Todd County27.1+0.3 pts
3Grant County26-0.4 pts
4Carroll County25.8-0.1 pts
5Bath County25.3-0.1 pts
6Boone County25-0.4 pts
7Whitley County24.9-0.1 pts
8Nicholas County24.8+0.3 pts
9Hart County24.7-0.1 pts
10Oldham County24.5-0.4 pts
11Webster County24.4+0.1 pts
12Fleming County24.4+0.5 pts
13Graves County24.2-0.2 pts
14Scott County24.1-0.3 pts
15Hardin County24.1-0.3 pts
16Barren County24-0 pts
17Jessamine County24-0.3 pts
18Butler County24-0 pts
19Logan County23.9-0 pts
20Daviess County23.8-0 pts
21Lincoln County23.8-0.4 pts
22Casey County23.6-0.1 pts
23Lewis County23.6-0.4 pts
24Gallatin County23.6-0.5 pts
25Carlisle County23.50 pts
26Monroe County23.5+0.1 pts
27Wolfe County23.5-0.1 pts
28Jackson County23.4-0.2 pts
29Warren County23.4-0.1 pts
30Grayson County23.3+0.3 pts
31Allen County23.3-0.3 pts
32Bracken County23.3-0.6 pts
33Knox County23.3-0.1 pts
34Simpson County23.2-0 pts
35Montgomery County23.2-0.2 pts
36Taylor County23.1+0.3 pts
37Metcalfe County23.1-0 pts
38Spencer County23-0.3 pts
39Lawrence County23-0.5 pts
40Washington County23-0.4 pts
41Cumberland County22.9+0.1 pts
42Harrison County22.9-0.1 pts
43Shelby County22.8-0.2 pts
44Owsley County22.8-0 pts
45Russell County22.8-0.1 pts
46Meade County22.8-0.2 pts
47Harlan County22.8-0.1 pts
48Ohio County22.7-0.5 pts
49Garrard County22.7-0.3 pts
50Marion County22.7-0.5 pts
51Henry County22.7-0.2 pts
52Powell County22.7-0.4 pts
53Clinton County22.7-0.2 pts
54Kenton County22.7-0.3 pts
55Breckinridge County22.6-0 pts
56Anderson County22.5-0.1 pts
57Caldwell County22.5+0.1 pts
58Nelson County22.5-0.3 pts
59Mason County22.5-0.2 pts
60McLean County22.40 pts
61Bourbon County22.4-0.2 pts
62Pendleton County22.3-0.5 pts
63McCreary County22.3-0.2 pts
64Owen County22.3-0.1 pts
65Larue County22.2-0.7 pts
66Crittenden County22.2-0.2 pts
67Hancock County22.2-0.1 pts
68Bell County22.2-0.1 pts
69Laurel County22.2-0.4 pts
70Hopkins County22.2-0.3 pts
71Trigg County22.2+0.2 pts
72Henderson County22.1-0.1 pts
73Robertson County22.1-0.6 pts
74Perry County22.1-0.1 pts
75Carter County22-0.1 pts
76Clark County22-0.1 pts
77Menifee County21.8-0.3 pts
78Pulaski County21.8-0.1 pts
79Breathitt County21.7-0.3 pts
80Jefferson County21.7-0 pts
81Rockcastle County21.60 pts
82Floyd County21.6-0.1 pts
83Magoffin County21.6-0.6 pts
84Green County21.6-0.2 pts
85Bullitt County21.5-0.4 pts
86Mercer County21.5-0.1 pts
87Adair County21.5+0.3 pts
88Union County21.5-0.6 pts
89Trimble County21.5-0.3 pts
90Clay County21.5-0 pts
91Johnson County21.5-0 pts
92Woodford County21.2-0.3 pts
93Letcher County21.2-0.2 pts
94Wayne County21.2-0.4 pts
95Boyd County21.1-0.2 pts
96McCracken County21.1-0.3 pts
97Muhlenberg County21-0.2 pts
98Greenup County20.9-0.4 pts
99Estill County20.9-0 pts
100Hickman County20.9+0.3 pts
101Leslie County20.90 pts
102Franklin County20.8-0.1 pts
103Madison County20.7-0.3 pts
104Fayette County20.5-0.3 pts
105Boyle County20.50 pts
106Fulton County20.4-0.1 pts
107Ballard County20.3+0.3 pts
108Campbell County20.1-0.3 pts
109Knott County20.1-0.2 pts
110Livingston County20-0.6 pts
111Pike County19.9-0.2 pts
112Edmonson County19.5-0.5 pts
113Morgan County19.50 pts
114Marshall County19.5-0.3 pts
115Rowan County19.2-0.3 pts
116Martin County18.9+0.1 pts
117Calloway County18.6-0.3 pts
118Lee County18-0 pts
119Elliott County17.7-0.3 pts
120Lyon County13.9+0.4 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, 2024) [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, 2024. 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=2024. 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, 2024. 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=2024.

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, 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2024,
  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, 2024}},
  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=2024. 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, 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2024.
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?

Christian County, with 27.9% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.9% in 2024.

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