Data / Rankings / Population under 18 / Counties in Kentucky

Counties in Kentucky by population under 18

Boone County had the highest population under 18 of 120 counties in 2017, at 26.9%. Lyon County had the lowest, at 13.6%. The median was 22.9% and the figure for Kentucky was 22.9%. Source: the U.S. Census Bureau.

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Highest26.9Boone County
Lowest13.6Lyon County
Median22.9120 counties
Kentucky22.9History

Map of counties, 2017

Adair County: 21.9 %Allen County: 24 %Anderson County: 24.3 %Ballard County: 21.4 %Barren County: 23.9 %Bath County: 25.5 %Bell County: 21.2 %Boone County: 26.9 %Bourbon County: 22.9 %Boyd County: 21.3 %Boyle County: 20.4 %Bracken County: 24.6 %Breathitt County: 21.3 %Breckinridge County: 23.7 %Bullitt County: 23.7 %Butler County: 23.8 %Caldwell County: 21.7 %Calloway County: 18.3 %Campbell County: 21.2 %Carlisle County: 22.8 %Carroll County: 25.2 %Carter County: 22.3 %Casey County: 23.5 %Christian County: 26 %Clark County: 22.5 %Clay County: 21.9 %Clinton County: 23.6 %Crittenden County: 22.9 %Cumberland County: 21.5 %Daviess County: 24.2 %Edmonson County: 21.6 %Elliott County: 20.1 %Estill County: 21.7 %Fayette County: 21.4 %Fleming County: 24.1 %Floyd County: 21.8 %Franklin County: 21.3 %Fulton County: 19.8 %Gallatin County: 26.1 %Garrard County: 23.1 %Grant County: 26.6 %Graves County: 24.3 %Grayson County: 23.4 %Green County: 21.9 %Greenup County: 22.1 %Hancock County: 24.8 %Hardin County: 24.4 %Harlan County: 22.2 %Harrison County: 22.9 %Hart County: 25.6 %Henderson County: 23.3 %Henry County: 23.3 %Hickman County: 22 %Hopkins County: 22.8 %Jackson County: 23.3 %Jefferson County: 22.1 %Jessamine County: 25.5 %Johnson County: 21.8 %Kenton County: 24.3 %Knott County: 21.2 %Knox County: 23.2 %Larue County: 23.6 %Laurel County: 23.5 %Lawrence County: 23.3 %Lee County: 20.2 %Leslie County: 21.6 %Letcher County: 21.6 %Lewis County: 23.5 %Lincoln County: 23.3 %Livingston County: 20.6 %Logan County: 23.9 %Lyon County: 13.6 %McCracken County: 22 %McCreary County: 22.5 %McLean County: 22.9 %Madison County: 21.1 %Magoffin County: 22.3 %Marion County: 24.3 %Marshall County: 20.9 %Martin County: 20.3 %Mason County: 23 %Meade County: 25.1 %Menifee County: 22.4 %Mercer County: 21.9 %Metcalfe County: 24.1 %Monroe County: 22.9 %Montgomery County: 24 %Morgan County: 20.4 %Muhlenberg County: 21.5 %Nelson County: 24.1 %Nicholas County: 23.9 %Ohio County: 24.8 %Oldham County: 26.6 %Owen County: 24.3 %Owsley County: 21 %Pendleton County: 23 %Perry County: 21.9 %Pike County: 20.6 %Powell County: 23.7 %Pulaski County: 22.5 %Robertson County: 22.4 %Rockcastle County: 22.1 %Rowan County: 19.1 %Russell County: 22.7 %Scott County: 26 %Shelby County: 24.7 %Simpson County: 23.9 %Spencer County: 24.1 %Taylor County: 22.4 %Todd County: 26.7 %Trigg County: 22 %Trimble County: 21.9 %Union County: 23 %Warren County: 23.1 %Washington County: 23.3 %Wayne County: 22.5 %Webster County: 22.8 %Whitley County: 24.3 %Wolfe County: 23.4 %Woodford County: 22.7 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Boone County: 26.9 %Boone County26.9Todd County: 26.7 %Todd County26.7Oldham County: 26.6 %Oldham County26.6Grant County: 26.6 %Grant County26.6Gallatin County: 26.1 %Gallatin County26.1Christian County: 26 %Christian County26Scott County: 26 %Scott County26Hart County: 25.6 %Hart County25.6Jessamine County: 25.5 %Jessamine County25.5Bath County: 25.5 %Bath County25.5Carroll County: 25.2 %Carroll County25.2Meade County: 25.1 %Meade County25.1Ohio County: 24.8 %Ohio County24.8Hancock County: 24.8 %Hancock County24.8Shelby County: 24.7 %Shelby County24.7Bracken County: 24.6 %Bracken County24.6Hardin County: 24.4 %Hardin County24.4Whitley County: 24.3 %Whitley County24.3Owen County: 24.3 %Owen County24.3Kenton County: 24.3 %Kenton County24.3Graves County: 24.3 %Graves County24.3Anderson County: 24.3 %Anderson County24.3Marion County: 24.3 %Marion County24.3Daviess County: 24.2 %Daviess County24.2Metcalfe County: 24.1 %Metcalfe County24.1Spencer County: 24.1 %Spencer County24.1Fleming County: 24.1 %Fleming County24.1Nelson County: 24.1 %Nelson County24.1Allen County: 24 %Allen County24Montgomery County: 24 %Montgomery County24Simpson County: 23.9 %Simpson County23.9Barren County: 23.9 %Barren County23.9Nicholas County: 23.9 %Nicholas County23.9Logan County: 23.9 %Logan County23.9Butler County: 23.8 %Butler County23.8Breckinridge County: 23.7 %Breckinridge County23.7Bullitt County: 23.7 %Bullitt County23.7Powell County: 23.7 %Powell County23.7Larue County: 23.6 %Larue County23.6Clinton County: 23.6 %Clinton County23.6Boone County: 26.9 %Boone County26.9Todd County: 26.7 %Todd County26.7Oldham County: 26.6 %Oldham County26.6Grant County: 26.6 %Grant County26.6Gallatin County: 26.1 %Gallatin County26.1Christian County: 26 %Christian County26Scott County: 26 %Scott County26Hart County: 25.6 %Hart County25.6Jessamine County: 25.5 %Jessamine County25.5Bath County: 25.5 %Bath County25.5Carroll County: 25.2 %Carroll County25.2Meade County: 25.1 %Meade County25.1Ohio County: 24.8 %Ohio County24.8Hancock County: 24.8 %Hancock County24.8Shelby County: 24.7 %Shelby County24.7Bracken County: 24.6 %Bracken County24.6Hardin County: 24.4 %Hardin County24.4Whitley County: 24.3 %Whitley County24.3Owen County: 24.3 %Owen County24.3Kenton County: 24.3 %Kenton County24.3Graves County: 24.3 %Graves County24.3Anderson County: 24.3 %Anderson County24.3Marion County: 24.3 %Marion County24.3Daviess County: 24.2 %Daviess County24.2Metcalfe County: 24.1 %Metcalfe County24.1Spencer County: 24.1 %Spencer County24.1Fleming County: 24.1 %Fleming County24.1Nelson County: 24.1 %Nelson County24.1Allen County: 24 %Allen County24Montgomery County: 24 %Montgomery County24Simpson County: 23.9 %Simpson County23.9Barren County: 23.9 %Barren County23.9Nicholas County: 23.9 %Nicholas County23.9Logan County: 23.9 %Logan County23.9Butler County: 23.8 %Butler County23.8Breckinridge County: 23.7 %Breckinridge County23.7Bullitt County: 23.7 %Bullitt County23.7Powell County: 23.7 %Powell County23.7Larue County: 23.6 %Larue County23.6Clinton County: 23.6 %Clinton County23.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Boone County26.9-0.3 pts
2Todd County26.7-0.5 pts
3Oldham County26.60 pts
4Grant County26.6-0.7 pts
5Gallatin County26.1+0.1 pts
6Christian County26-0.6 pts
7Scott County26-0.1 pts
8Hart County25.6+0.7 pts
9Jessamine County25.5+0.1 pts
10Bath County25.50 pts
11Carroll County25.2-0.3 pts
12Meade County25.1-0.1 pts
13Ohio County24.8+0.1 pts
14Hancock County24.8-0.2 pts
15Shelby County24.7-0.3 pts
16Bracken County24.6-0.3 pts
17Hardin County24.4-0.1 pts
18Whitley County24.3+0.3 pts
19Owen County24.3+0.1 pts
20Kenton County24.3-0.2 pts
21Graves County24.3-0.1 pts
22Anderson County24.3+0.2 pts
23Marion County24.3-0.1 pts
24Daviess County24.2-0.1 pts
25Metcalfe County24.1+0.2 pts
26Spencer County24.1-0.1 pts
27Fleming County24.1-0.3 pts
28Nelson County24.1-0.3 pts
29Allen County24-0.1 pts
30Montgomery County24-0.1 pts
31Simpson County23.9-0.2 pts
32Barren County23.9-0 pts
33Nicholas County23.9-0.1 pts
34Logan County23.9+0.1 pts
35Butler County23.8+0.4 pts
36Breckinridge County23.7+0.1 pts
37Bullitt County23.7-0.1 pts
38Powell County23.7-0.1 pts
39Larue County23.6+0.6 pts
40Clinton County23.6-0.3 pts
41Laurel County23.5+0.1 pts
42Casey County23.50 pts
43Lewis County23.5+0.3 pts
44Wolfe County23.4+0.1 pts
45Grayson County23.4-0 pts
46Jackson County23.3+0.5 pts
47Lincoln County23.3+0.3 pts
48Lawrence County23.30 pts
49Washington County23.3+0.3 pts
50Henderson County23.3-0.1 pts
51Henry County23.3-0.3 pts
52Knox County23.2-0.3 pts
53Warren County23.1+0.1 pts
54Garrard County23.1-0.1 pts
55Mason County23-0.2 pts
56Pendleton County23-0.3 pts
57Union County23+0.4 pts
58Bourbon County22.9+0.1 pts
59Crittenden County22.9-0.4 pts
60Monroe County22.9-0 pts
61Harrison County22.9-0.2 pts
62McLean County22.9-0.4 pts
63Carlisle County22.8+0.4 pts
64Hopkins County22.8-0.1 pts
64Webster County22.8-0.1 pts
66Russell County22.7+0.1 pts
67Woodford County22.7-0.1 pts
68Pulaski County22.5+0.1 pts
69Clark County22.5-0.2 pts
70Wayne County22.5-0.1 pts
71McCreary County22.50 pts
72Menifee County22.4-0.3 pts
73Robertson County22.4+0.8 pts
74Taylor County22.40 pts
75Carter County22.3+0.1 pts
76Magoffin County22.3-0.2 pts
77Harlan County22.2+0.2 pts
78Jefferson County22.1-0.2 pts
79Greenup County22.1-0.1 pts
80Rockcastle County22.1-0.2 pts
81McCracken County22+0.1 pts
82Hickman County22+0.5 pts
83Trigg County22-0 pts
84Green County21.90 pts
85Perry County21.9+0.2 pts
86Trimble County21.9-0.6 pts
87Mercer County21.9-0.2 pts
88Adair County21.9+0.2 pts
89Clay County21.9+0.1 pts
90Johnson County21.8-0.4 pts
91Floyd County21.8+0.1 pts
92Caldwell County21.7-0.1 pts
93Estill County21.7-0.3 pts
94Leslie County21.6+0.1 pts
95Edmonson County21.6+0.2 pts
96Letcher County21.6-0 pts
97Muhlenberg County21.5+0.1 pts
98Cumberland County21.5-0.3 pts
99Ballard County21.4-0.5 pts
100Fayette County21.4-0.1 pts
101Franklin County21.3-0 pts
102Breathitt County21.3-0.3 pts
103Boyd County21.3-0.1 pts
104Campbell County21.2-0.3 pts
105Knott County21.2-0.1 pts
106Bell County21.2-0.1 pts
107Madison County21.1-0.3 pts
108Owsley County21-0.3 pts
109Marshall County20.90 pts
110Pike County20.6-0.2 pts
111Livingston County20.6+0.4 pts
112Morgan County20.4-0 pts
113Boyle County20.4-0.3 pts
114Martin County20.3-0.1 pts
115Lee County20.2+0.3 pts
116Elliott County20.1+0.1 pts
117Fulton County19.8-0.1 pts
118Rowan County19.1+0.1 pts
119Calloway County18.3+0.2 pts
120Lyon County13.6-0.1 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2017.
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?

Boone County, with 26.9% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 13.6% in 2017.

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