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 2023, at 27.9%. Lyon County had the lowest, at 13.5%. The median was 22.6% and the figure for Kentucky was 22.4%. Source: the U.S. Census Bureau.

Highest27.9Christian County
Lowest13.5Lyon County
Median22.6120 counties
Kentucky22.4History

Top 40 counties, 2023

Christian County: 27.9 %Christian County27.9Todd County: 26.8 %Todd County26.8Grant County: 26.4 %Grant County26.4Carroll County: 25.9 %Carroll County25.9Boone County: 25.4 %Boone County25.4Bath County: 25.4 %Bath County25.4Whitley County: 25 %Whitley County25Oldham County: 24.9 %Oldham County24.9Hart County: 24.7 %Hart County24.7Nicholas County: 24.5 %Nicholas County24.5Scott County: 24.4 %Scott County24.4Hardin County: 24.4 %Hardin County24.4Jessamine County: 24.4 %Jessamine County24.4Graves County: 24.3 %Graves County24.3Webster County: 24.3 %Webster County24.3Lincoln County: 24.2 %Lincoln County24.2Gallatin County: 24.1 %Gallatin County24.1Barren County: 24 %Barren County24Butler County: 24 %Butler County24Lewis County: 24 %Lewis County24Logan County: 24 %Logan County24Bracken County: 23.9 %Bracken County23.9Fleming County: 23.9 %Fleming County23.9Daviess County: 23.8 %Daviess County23.8Casey County: 23.7 %Casey County23.7Wolfe County: 23.6 %Wolfe County23.6Jackson County: 23.6 %Jackson County23.6Allen County: 23.6 %Allen County23.6Lawrence County: 23.5 %Lawrence County23.5Carlisle County: 23.5 %Carlisle County23.5Warren County: 23.5 %Warren County23.5Monroe County: 23.5 %Monroe County23.5Washington County: 23.4 %Washington County23.4Montgomery County: 23.4 %Montgomery County23.4Knox County: 23.3 %Knox County23.3Spencer County: 23.3 %Spencer County23.3Simpson County: 23.3 %Simpson County23.3Ohio County: 23.3 %Ohio County23.3Marion County: 23.2 %Marion County23.2Powell County: 23.1 %Powell County23.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Christian County27.9+0.9 pts
2Todd County26.8-0.4 pts
3Grant County26.4-0.3 pts
4Carroll County25.9+0.2 pts
5Boone County25.4-0.3 pts
6Bath County25.4-0.2 pts
7Whitley County25-0.1 pts
8Oldham County24.9-0.5 pts
9Hart County24.7-0.5 pts
10Nicholas County24.5-0.4 pts
11Scott County24.4-0.3 pts
12Hardin County24.4-0.1 pts
13Jessamine County24.4-0.3 pts
14Graves County24.3-0.2 pts
15Webster County24.3+0.3 pts
16Lincoln County24.20 pts
17Gallatin County24.1-0.3 pts
18Barren County24-0.1 pts
19Butler County24-0.1 pts
20Lewis County24-0 pts
21Logan County24-0.2 pts
22Bracken County23.9-0.1 pts
23Fleming County23.9+0.1 pts
24Daviess County23.8-0.1 pts
25Casey County23.7-0.3 pts
26Wolfe County23.6-0.4 pts
27Jackson County23.60 pts
28Allen County23.60 pts
29Lawrence County23.5-0.1 pts
30Carlisle County23.5-0.1 pts
31Warren County23.5-0.1 pts
32Monroe County23.50 pts
33Washington County23.4+0.4 pts
34Montgomery County23.40 pts
35Knox County23.3-0.2 pts
36Spencer County23.3-0.3 pts
37Simpson County23.3+0.4 pts
38Ohio County23.3-0.4 pts
39Marion County23.2-0.2 pts
40Powell County23.1-0.6 pts
41Metcalfe County23.1-0.2 pts
42Grayson County23.1-0.2 pts
43Shelby County23.1-0.2 pts
44Meade County23-0.4 pts
45Garrard County23+0.1 pts
46Kenton County23-0.2 pts
47Harrison County23+0.1 pts
48Larue County22.9-0.1 pts
49Russell County22.9+0.1 pts
50Clinton County22.9-0.1 pts
51Henry County22.90 pts
52Pendleton County22.9-0.2 pts
53Owsley County22.8+0.1 pts
54Harlan County22.80 pts
55Nelson County22.8-0.4 pts
56Taylor County22.8-0.1 pts
57Cumberland County22.8+0.6 pts
58Robertson County22.7+0.8 pts
59Breckinridge County22.7-0.3 pts
60Anderson County22.6-0.1 pts
61Mason County22.6-0.2 pts
62Bourbon County22.6-0.2 pts
63Laurel County22.6-0.3 pts
64Hopkins County22.5-0.1 pts
65McCreary County22.4-0.2 pts
66Crittenden County22.4-0.1 pts
67McLean County22.4-0.1 pts
68Caldwell County22.4+0.1 pts
69Owen County22.4-0.6 pts
70Bell County22.3+0.1 pts
71Hancock County22.3-0.7 pts
72Henderson County22.2-0.2 pts
73Carter County22.2-0 pts
74Menifee County22.2+0.1 pts
75Magoffin County22.1-0 pts
75Perry County22.1+0.1 pts
77Clark County22.1+0.1 pts
78Union County22.1-0.4 pts
79Breathitt County22-0.2 pts
80Bullitt County22-0.3 pts
81Trigg County22-0.3 pts
82Pulaski County21.9-0.1 pts
83Trimble County21.8-0.1 pts
84Green County21.7-0.1 pts
84Jefferson County21.7+0.1 pts
86Floyd County21.7-0.2 pts
87Mercer County21.6-0.2 pts
88Rockcastle County21.6-0.2 pts
89Wayne County21.6-0.4 pts
90Woodford County21.6-0.2 pts
91Johnson County21.5-0.1 pts
92Clay County21.5-0.1 pts
93Letcher County21.4-0.2 pts
94McCracken County21.3-0.2 pts
95Greenup County21.3-0.4 pts
96Boyd County21.3-0.2 pts
97Adair County21.20 pts
98Muhlenberg County21.1-0.1 pts
99Madison County21-0.2 pts
100Estill County20.9-0.2 pts
101Franklin County20.9-0.1 pts
102Leslie County20.9-0.3 pts
103Fayette County20.8-0.1 pts
104Hickman County20.6-0 pts
105Livingston County20.5-0.2 pts
106Fulton County20.5+0.4 pts
107Boyle County20.4-0.3 pts
108Campbell County20.4-0.2 pts
109Knott County20.3-0.5 pts
110Pike County20.1-0.2 pts
111Ballard County20-0.1 pts
112Edmonson County20-0.5 pts
113Marshall County19.7-0.3 pts
114Rowan County19.5-0.4 pts
115Morgan County19.40 pts
116Calloway County19+0.2 pts
117Martin County18.8-0.1 pts
118Elliott County18-0.1 pts
119Lee County18-0 pts
120Lyon County13.5+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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2023.
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 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.5% in 2023.

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