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 2018, at 27%. Lyon County had the lowest, at 13.4%. The median was 22.9% and the figure for Kentucky was 22.8%. Source: the U.S. Census Bureau.

Highest27Todd County
Lowest13.4Lyon County
Median22.9120 counties
Kentucky22.8History

Top 40 counties, 2018

Todd County: 27 %Todd County27Oldham County: 26.8 %Oldham County26.8Boone County: 26.6 %Boone County26.6Grant County: 26.4 %Grant County26.4Christian County: 26.2 %Christian County26.2Gallatin County: 25.9 %Gallatin County25.9Scott County: 25.8 %Scott County25.8Hart County: 25.6 %Hart County25.6Bath County: 25.4 %Bath County25.4Jessamine County: 25.3 %Jessamine County25.3Meade County: 25.2 %Meade County25.2Carroll County: 25 %Carroll County25Ohio County: 24.7 %Ohio County24.7Shelby County: 24.5 %Shelby County24.5Hancock County: 24.5 %Hancock County24.5Hardin County: 24.4 %Hardin County24.4Owen County: 24.3 %Owen County24.3Graves County: 24.3 %Graves County24.3Whitley County: 24.3 %Whitley County24.3Bracken County: 24.2 %Bracken County24.2Kenton County: 24.2 %Kenton County24.2Daviess County: 24.2 %Daviess County24.2Marion County: 24.1 %Marion County24.1Nicholas County: 24 %Nicholas County24Fleming County: 24 %Fleming County24Spencer County: 24 %Spencer County24Barren County: 23.9 %Barren County23.9Montgomery County: 23.8 %Montgomery County23.8Casey County: 23.8 %Casey County23.8Butler County: 23.8 %Butler County23.8Nelson County: 23.8 %Nelson County23.8Powell County: 23.7 %Powell County23.7Simpson County: 23.7 %Simpson County23.7Metcalfe County: 23.7 %Metcalfe County23.7Allen County: 23.7 %Allen County23.7Anderson County: 23.7 %Anderson County23.7Lincoln County: 23.5 %Lincoln County23.5Bullitt County: 23.5 %Bullitt County23.5Logan County: 23.5 %Logan County23.5Monroe County: 23.5 %Monroe County23.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Todd County27+0.3 pts
2Oldham County26.8+0.2 pts
3Boone County26.6-0.2 pts
4Grant County26.4-0.2 pts
5Christian County26.2+0.2 pts
6Gallatin County25.9-0.2 pts
7Scott County25.8-0.1 pts
8Hart County25.6-0 pts
9Bath County25.4-0 pts
10Jessamine County25.3-0.2 pts
11Meade County25.2+0.1 pts
12Carroll County25-0.2 pts
13Ohio County24.7-0.1 pts
14Shelby County24.5-0.1 pts
15Hancock County24.5-0.3 pts
16Hardin County24.40 pts
17Owen County24.3-0 pts
18Graves County24.30 pts
19Whitley County24.3-0.1 pts
20Bracken County24.2-0.3 pts
21Kenton County24.2-0.1 pts
22Daviess County24.2-0 pts
23Marion County24.1-0.2 pts
24Nicholas County24+0.1 pts
25Fleming County24-0.1 pts
26Spencer County24-0.1 pts
27Barren County23.9-0 pts
28Montgomery County23.8-0.2 pts
29Casey County23.8+0.3 pts
30Butler County23.80 pts
31Nelson County23.8-0.3 pts
32Powell County23.7+0.1 pts
33Simpson County23.7-0.2 pts
34Metcalfe County23.7-0.4 pts
35Allen County23.7-0.4 pts
36Anderson County23.7-0.6 pts
37Lincoln County23.5+0.2 pts
38Bullitt County23.5-0.2 pts
39Logan County23.5-0.4 pts
40Monroe County23.5+0.6 pts
41Lewis County23.4-0.1 pts
42Laurel County23.4-0.1 pts
43Breckinridge County23.4-0.3 pts
44McLean County23.4+0.5 pts
45Clinton County23.4-0.2 pts
46Larue County23.4-0.2 pts
47Warren County23.3+0.2 pts
48Knox County23.3+0.1 pts
49Wolfe County23.3-0.2 pts
50Henry County23.3-0 pts
51Grayson County23.2-0.2 pts
52Pendleton County23.2+0.2 pts
53Washington County23.2-0.1 pts
54Webster County23.2+0.4 pts
55Henderson County23.2-0.1 pts
56Lawrence County23.2-0.1 pts
57Bourbon County23.1+0.2 pts
58Union County230 pts
59Jackson County22.9-0.4 pts
60Garrard County22.9-0.2 pts
61Russell County22.8+0.1 pts
62Mason County22.8-0.2 pts
63Crittenden County22.7-0.2 pts
64Hopkins County22.7-0.1 pts
65McCreary County22.6+0.2 pts
66Carlisle County22.6-0.2 pts
67Menifee County22.5+0.1 pts
68Pulaski County22.5-0 pts
69Woodford County22.4-0.4 pts
70Wayne County22.4-0.1 pts
71Clark County22.4-0.1 pts
72Trigg County22.3+0.3 pts
73Harrison County22.3-0.6 pts
74Carter County22.2-0.1 pts
75Taylor County22.2-0.2 pts
76Harlan County22.2-0 pts
77Robertson County22.1-0.3 pts
78Rockcastle County22.10 pts
79Greenup County22.10 pts
80Owsley County22+1.1 pts
81Mercer County22+0.1 pts
82McCracken County21.9-0 pts
83Perry County21.90 pts
84Jefferson County21.9-0.2 pts
85Magoffin County21.9-0.4 pts
86Johnson County21.8-0 pts
87Floyd County21.80 pts
88Trimble County21.8-0.1 pts
89Clay County21.8-0.1 pts
90Green County21.7-0.2 pts
91Estill County21.7-0 pts
92Breathitt County21.7+0.4 pts
93Adair County21.7-0.2 pts
94Cumberland County21.6+0.1 pts
95Caldwell County21.6-0.2 pts
96Leslie County21.5-0.1 pts
97Muhlenberg County21.4-0.1 pts
98Edmonson County21.4-0.2 pts
99Letcher County21.3-0.2 pts
100Fayette County21.3-0.1 pts
101Franklin County21.3-0 pts
102Ballard County21.3-0.1 pts
103Boyd County21.2-0 pts
104Hickman County21.2-0.7 pts
105Bell County21.20 pts
106Campbell County21.2-0.1 pts
107Knott County21.1-0.1 pts
108Madison County21-0.1 pts
109Marshall County20.7-0.2 pts
110Pike County20.6-0 pts
111Livingston County20.5-0.1 pts
112Boyle County20.3-0.1 pts
113Morgan County20.2-0.3 pts
114Elliott County20.2+0.1 pts
115Fulton County20.1+0.3 pts
116Martin County20-0.3 pts
117Rowan County19.6+0.5 pts
118Lee County19.5-0.7 pts
119Calloway County18.5+0.2 pts
120Lyon County13.4-0.2 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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.

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, 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2018,
  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, 2018}},
  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=2018. 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, 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2018.
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 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.4% in 2018.

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