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 2019, at 26.8%. Lyon County had the lowest, at 13.6%. The median was 22.8% and the figure for Kentucky was 22.7%. Source: the U.S. Census Bureau.

Highest26.8Todd County
Lowest13.6Lyon County
Median22.8120 counties
Kentucky22.7History

Top 40 counties, 2019

Todd County: 26.8 %Todd County26.8Oldham County: 26.7 %Oldham County26.7Boone County: 26.5 %Boone County26.5Grant County: 26.2 %Grant County26.2Christian County: 26.1 %Christian County26.1Scott County: 25.8 %Scott County25.8Hart County: 25.5 %Hart County25.5Bath County: 25.5 %Bath County25.5Gallatin County: 25.3 %Gallatin County25.3Meade County: 25.2 %Meade County25.2Jessamine County: 25.1 %Jessamine County25.1Carroll County: 24.9 %Carroll County24.9Ohio County: 24.6 %Ohio County24.6Nicholas County: 24.5 %Nicholas County24.5Graves County: 24.4 %Graves County24.4Shelby County: 24.4 %Shelby County24.4Hardin County: 24.3 %Hardin County24.3Bracken County: 24.2 %Bracken County24.2Whitley County: 24.2 %Whitley County24.2Owen County: 24.2 %Owen County24.2Daviess County: 24 %Daviess County24Casey County: 24 %Casey County24Marion County: 24 %Marion County24Fleming County: 24 %Fleming County24Barren County: 24 %Barren County24Butler County: 23.9 %Butler County23.9Kenton County: 23.9 %Kenton County23.9Hancock County: 23.9 %Hancock County23.9Larue County: 23.8 %Larue County23.8Spencer County: 23.8 %Spencer County23.8Allen County: 23.8 %Allen County23.8Nelson County: 23.7 %Nelson County23.7Powell County: 23.6 %Powell County23.6Anderson County: 23.6 %Anderson County23.6Lewis County: 23.5 %Lewis County23.5Montgomery County: 23.5 %Montgomery County23.5Simpson County: 23.5 %Simpson County23.5Metcalfe County: 23.5 %Metcalfe County23.5Warren County: 23.5 %Warren County23.5Clinton County: 23.4 %Clinton County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Todd County26.8-0.2 pts
2Oldham County26.7-0.1 pts
3Boone County26.5-0.2 pts
4Grant County26.2-0.2 pts
5Christian County26.1-0 pts
6Scott County25.8-0.1 pts
7Hart County25.5-0 pts
8Bath County25.5+0.1 pts
9Gallatin County25.3-0.7 pts
10Meade County25.2-0 pts
11Jessamine County25.1-0.2 pts
12Carroll County24.9-0.1 pts
13Ohio County24.6-0.1 pts
14Nicholas County24.5+0.5 pts
15Graves County24.4+0.1 pts
16Shelby County24.4-0.2 pts
17Hardin County24.3-0.1 pts
18Bracken County24.20 pts
19Whitley County24.2-0 pts
20Owen County24.2-0.2 pts
21Daviess County24-0.1 pts
22Casey County24+0.2 pts
23Marion County24-0.1 pts
24Fleming County240 pts
25Barren County24+0.1 pts
26Butler County23.9+0.2 pts
27Kenton County23.9-0.2 pts
28Hancock County23.9-0.6 pts
29Larue County23.8+0.4 pts
30Spencer County23.8-0.2 pts
31Allen County23.8+0.1 pts
32Nelson County23.7-0.1 pts
33Powell County23.6-0.1 pts
34Anderson County23.6-0 pts
35Lewis County23.5+0.1 pts
36Montgomery County23.5-0.3 pts
37Simpson County23.5-0.2 pts
38Metcalfe County23.5-0.2 pts
39Warren County23.5+0.2 pts
40Clinton County23.4+0.1 pts
41Logan County23.4-0.1 pts
42Laurel County23.40 pts
43Bullitt County23.4-0.1 pts
44Pendleton County23.4+0.2 pts
45Wolfe County23.4+0.1 pts
46Lincoln County23.3-0.2 pts
47Union County23.3+0.3 pts
48Garrard County23.2+0.3 pts
49Webster County23.2-0 pts
50Monroe County23.2-0.3 pts
51Knox County23.1-0.1 pts
52Breckinridge County23.1-0.3 pts
53Carlisle County23.1+0.5 pts
54Bourbon County23-0.1 pts
55Henderson County23-0.2 pts
56Washington County22.9-0.3 pts
57Lawrence County22.9-0.3 pts
58Grayson County22.9-0.4 pts
59McLean County22.8-0.6 pts
60Menifee County22.8+0.3 pts
61Jackson County22.7-0.2 pts
62Russell County22.7-0.1 pts
63Henry County22.7-0.6 pts
64Hopkins County22.6-0.1 pts
65Mason County22.6-0.2 pts
66Wayne County22.6+0.2 pts
67McCreary County22.6-0.1 pts
68Harrison County22.4+0.2 pts
69Crittenden County22.4-0.3 pts
70Pulaski County22.3-0.2 pts
70Taylor County22.3+0.2 pts
72Harlan County22.3+0.1 pts
73Clark County22.2-0.2 pts
74Woodford County22.1-0.2 pts
75Mercer County22.1+0.1 pts
76Greenup County22-0 pts
77Carter County21.9-0.2 pts
78Breathitt County21.9+0.2 pts
79McCracken County21.8-0.1 pts
80Floyd County21.80 pts
81Johnson County21.80 pts
82Caldwell County21.8+0.3 pts
83Robertson County21.8-0.3 pts
84Rockcastle County21.8-0.3 pts
85Perry County21.8-0.2 pts
86Jefferson County21.7-0.2 pts
87Trigg County21.7-0.6 pts
88Magoffin County21.7-0.2 pts
89Green County21.7-0 pts
90Estill County21.7-0 pts
91Trimble County21.7-0.1 pts
92Clay County21.6-0.2 pts
93Owsley County21.5-0.5 pts
94Leslie County21.50 pts
95Muhlenberg County21.5+0.1 pts
96Edmonson County21.40 pts
97Letcher County21.4+0.1 pts
98Adair County21.3-0.4 pts
99Cumberland County21.3-0.3 pts
100Fayette County21.3-0 pts
101Hickman County21.3+0.1 pts
102Boyd County21.1-0.1 pts
103Knott County21.10 pts
104Campbell County21.1-0.1 pts
105Bell County21.1-0.1 pts
106Ballard County21-0.3 pts
107Madison County21+0.1 pts
108Franklin County21-0.3 pts
109Marshall County20.7-0.1 pts
110Pike County20.60 pts
111Morgan County20.3+0.1 pts
112Livingston County20.1-0.4 pts
113Boyle County20.1-0.2 pts
114Fulton County19.9-0.2 pts
115Elliott County19.8-0.4 pts
116Martin County19.7-0.3 pts
117Rowan County19.6-0 pts
118Lee County18.9-0.6 pts
119Calloway County18.3-0.2 pts
120Lyon County13.6+0.2 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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2019.
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 26.8% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.6% in 2019.

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