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 2015, at 27.4%. Lyon County had the lowest, at 14%. The median was 22.8% and the figure for Kentucky was 23%. Source: the U.S. Census Bureau.

Highest27.4Boone County
Lowest14Lyon County
Median22.8120 counties
Kentucky23History

Top 40 counties, 2015

Boone County: 27.4 %Boone County27.4Todd County: 27.3 %Todd County27.3Grant County: 27.1 %Grant County27.1Christian County: 27 %Christian County27Oldham County: 26.5 %Oldham County26.5Scott County: 26.2 %Scott County26.2Jessamine County: 25.5 %Jessamine County25.5Gallatin County: 25.4 %Gallatin County25.4Meade County: 25.4 %Meade County25.4Bath County: 25.2 %Bath County25.2Carroll County: 25.1 %Carroll County25.1Shelby County: 25 %Shelby County25Hart County: 24.9 %Hart County24.9Nelson County: 24.8 %Nelson County24.8Kenton County: 24.6 %Kenton County24.6Hancock County: 24.6 %Hancock County24.6Marion County: 24.6 %Marion County24.6Ohio County: 24.6 %Ohio County24.6Hardin County: 24.6 %Hardin County24.6Bracken County: 24.6 %Bracken County24.6Spencer County: 24.5 %Spencer County24.5Graves County: 24.5 %Graves County24.5Owen County: 24.5 %Owen County24.5Simpson County: 24.3 %Simpson County24.3Montgomery County: 24.3 %Montgomery County24.3Fleming County: 24.3 %Fleming County24.3Daviess County: 24.3 %Daviess County24.3Allen County: 24.3 %Allen County24.3Whitley County: 24 %Whitley County24Anderson County: 24 %Anderson County24Logan County: 23.9 %Logan County23.9Barren County: 23.9 %Barren County23.9Bullitt County: 23.9 %Bullitt County23.9Clinton County: 23.8 %Clinton County23.8Grayson County: 23.7 %Grayson County23.7Powell County: 23.7 %Powell County23.7Butler County: 23.7 %Butler County23.7Metcalfe County: 23.6 %Metcalfe County23.6Laurel County: 23.6 %Laurel County23.6Nicholas County: 23.6 %Nicholas County23.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Boone County27.4-0 pts
2Todd County27.3-0 pts
3Grant County27.1-0.3 pts
4Christian County27-0.3 pts
5Oldham County26.5-0.2 pts
6Scott County26.2-0 pts
7Jessamine County25.5-0.1 pts
8Gallatin County25.4-0.6 pts
9Meade County25.4-0.5 pts
10Bath County25.2-0.2 pts
11Carroll County25.1+0.1 pts
12Shelby County25+0.1 pts
13Hart County24.9+0.1 pts
14Nelson County24.8-0.2 pts
15Kenton County24.6-0.1 pts
16Hancock County24.6-0.3 pts
17Marion County24.6+0.1 pts
18Ohio County24.6+0.1 pts
19Hardin County24.6-0.4 pts
20Bracken County24.6-0.1 pts
21Spencer County24.5-0 pts
22Graves County24.5-0.3 pts
23Owen County24.5-0 pts
24Simpson County24.3+0.1 pts
25Montgomery County24.30 pts
26Fleming County24.3+0.2 pts
27Daviess County24.3+0.1 pts
28Allen County24.3+0.2 pts
29Whitley County24+0.4 pts
30Anderson County24-0.2 pts
31Logan County23.9-0.2 pts
32Barren County23.9+0.1 pts
33Bullitt County23.9-0.2 pts
34Clinton County23.8+0.1 pts
35Grayson County23.7-0 pts
36Powell County23.7+0.2 pts
37Butler County23.7+0.2 pts
38Metcalfe County23.6-0 pts
39Laurel County23.6-0.1 pts
40Nicholas County23.6+0.2 pts
41Knox County23.6-0.2 pts
42Lewis County23.5+0.2 pts
43Lincoln County23.4-0.3 pts
44Breckinridge County23.4+0.1 pts
45Henderson County23.40 pts
46Crittenden County23.3+0.4 pts
47Wolfe County23.3-0.7 pts
48Henry County23.2-0.3 pts
49McLean County23.1-0.1 pts
50Harrison County23.1-0.4 pts
51Casey County23.1+0.2 pts
52Washington County23.1-0.1 pts
53Mason County23.1-0.2 pts
54Larue County23.1-0.2 pts
55Lawrence County23+0.2 pts
56Bourbon County230 pts
57Garrard County22.9+0.3 pts
58Jackson County22.9+0.2 pts
59Pendleton County22.9+0.2 pts
60Trimble County22.8-0.4 pts
60Warren County22.8-0 pts
62Hopkins County22.8-0 pts
63Monroe County22.8+0.1 pts
64Clark County22.7-0 pts
65Webster County22.7-0.3 pts
66Woodford County22.7-0.2 pts
67Pulaski County22.6-0 pts
68Wayne County22.6+0.4 pts
69Union County22.5+0.3 pts
70Magoffin County22.5-0.5 pts
71Johnson County22.4-0 pts
72Jefferson County22.4-0.1 pts
73Ballard County22.4+0.3 pts
74Russell County22.3-0.1 pts
75Carlisle County22.3-0.3 pts
76Carter County22.3-0.1 pts
77Greenup County22.2-0 pts
78Rockcastle County22.2-0.2 pts
79McCreary County22.2-0.2 pts
80Menifee County22.2+0.3 pts
81Mercer County22.2+0.1 pts
82Taylor County22.10 pts
83Harlan County22-0.3 pts
84Estill County22-0.1 pts
85Caldwell County22-0.2 pts
86Leslie County21.9+0.2 pts
87Campbell County21.9-0.1 pts
88Green County21.9+0.3 pts
89Floyd County21.8-0.2 pts
90Adair County21.8+0.1 pts
91Trigg County21.7-0.2 pts
92McCracken County21.7-0.2 pts
93Cumberland County21.6+0.2 pts
94Breathitt County21.6-0.3 pts
95Clay County21.4-0.1 pts
96Perry County21.40 pts
97Letcher County21.4-0.4 pts
98Muhlenberg County21.40 pts
99Madison County21.4+0.1 pts
100Fayette County21.3-0.1 pts
101Boyd County21.3+0.1 pts
102Hickman County21.3+0.6 pts
103Franklin County21.30 pts
104Robertson County21.2+0.7 pts
105Edmonson County21.1-0 pts
106Owsley County21.1-0 pts
107Bell County21-0.4 pts
108Knott County21-0.3 pts
109Pike County20.9-0.1 pts
110Martin County20.7-0.3 pts
111Marshall County20.7+0.3 pts
112Livingston County20.60 pts
113Fulton County20.5+0.2 pts
114Boyle County20.50 pts
115Morgan County20.3+0.2 pts
116Lee County20-0.6 pts
117Elliott County19.9+0.1 pts
118Rowan County19.2+0.3 pts
119Calloway County18.30 pts
120Lyon County14-0.5 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kentucky_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kentucky-counties?period=2015.
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 27.4% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lyon County, with 14% in 2015.

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