Data / Rankings / Population under 18 / Counties in Tennessee

Counties in Tennessee by population under 18

Williamson County had the highest population under 18 of 95 counties in 2019, at 27.7%. Lake County had the lowest, at 15%. The median was 21.1% and the figure for Tennessee was 22.2%. Source: the U.S. Census Bureau.

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Highest27.7Williamson County
Lowest15Lake County
Median21.195 counties
Tennessee22.2History

Map of counties, 2019

Anderson County: 21.1 %Bedford County: 25.2 %Benton County: 19.6 %Bledsoe County: 17.4 %Blount County: 20.5 %Bradley County: 22 %Campbell County: 20.4 %Cannon County: 21.5 %Carroll County: 20.8 %Carter County: 18.7 %Cheatham County: 21.6 %Chester County: 21.9 %Claiborne County: 19.2 %Clay County: 20.3 %Cocke County: 19.7 %Coffee County: 23 %Crockett County: 23.4 %Cumberland County: 17.4 %Davidson County: 20.3 %Decatur County: 20 %DeKalb County: 22 %Dickson County: 22.7 %Dyer County: 24.2 %Fayette County: 19.2 %Fentress County: 20.7 %Franklin County: 19.7 %Gibson County: 24 %Giles County: 20.9 %Grainger County: 20.6 %Greene County: 19.8 %Grundy County: 20.8 %Hamblen County: 23.2 %Hamilton County: 21.1 %Hancock County: 21.5 %Hardeman County: 18.5 %Hardin County: 20.4 %Hawkins County: 20.1 %Haywood County: 22.9 %Henderson County: 22.5 %Henry County: 20.8 %Hickman County: 20.7 %Houston County: 21.2 %Humphreys County: 22.5 %Jackson County: 18.4 %Jefferson County: 20.1 %Johnson County: 17.6 %Knox County: 21.1 %Lake County: 15 %Lauderdale County: 22.1 %Lawrence County: 24.5 %Lewis County: 22.7 %Lincoln County: 22.3 %Loudon County: 18.7 %McMinn County: 21.2 %McNairy County: 21 %Macon County: 24.3 %Madison County: 22 %Marion County: 20.5 %Marshall County: 23.3 %Maury County: 23.1 %Meigs County: 20.6 %Monroe County: 21.2 %Montgomery County: 27.1 %Moore County: 20.8 %Morgan County: 19.7 %Obion County: 21.7 %Overton County: 21.7 %Perry County: 21.2 %Pickett County: 18.8 %Polk County: 19 %Putnam County: 21 %Rhea County: 22.1 %Roane County: 19.4 %Robertson County: 23.8 %Rutherford County: 25.3 %Scott County: 24.5 %Sequatchie County: 20.9 %Sevier County: 20.4 %Shelby County: 24.2 %Smith County: 22.7 %Stewart County: 21.2 %Sullivan County: 19.2 %Sumner County: 23.9 %Tipton County: 24.7 %Trousdale County: 18.2 %Unicoi County: 18.3 %Union County: 22.6 %Van Buren County: 21.2 %Warren County: 23.2 %Washington County: 19.1 %Wayne County: 18.1 %Weakley County: 19.6 %White County: 22.1 %Williamson County: 27.7 %Wilson County: 23.8 %
  • Under 19
  • 19 to 20
  • 20 to 21
  • 21 to 22
  • 22 to 23
  • 23 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

Williamson County: 27.7 %Williamson County27.7Montgomery County: 27.1 %Montgomery County27.1Rutherford County: 25.3 %Rutherford County25.3Bedford County: 25.2 %Bedford County25.2Tipton County: 24.7 %Tipton County24.7Lawrence County: 24.5 %Lawrence County24.5Scott County: 24.5 %Scott County24.5Macon County: 24.3 %Macon County24.3Shelby County: 24.2 %Shelby County24.2Dyer County: 24.2 %Dyer County24.2Gibson County: 24 %Gibson County24Sumner County: 23.9 %Sumner County23.9Robertson County: 23.8 %Robertson County23.8Wilson County: 23.8 %Wilson County23.8Crockett County: 23.4 %Crockett County23.4Marshall County: 23.3 %Marshall County23.3Warren County: 23.2 %Warren County23.2Hamblen County: 23.2 %Hamblen County23.2Maury County: 23.1 %Maury County23.1Coffee County: 23 %Coffee County23Haywood County: 22.9 %Haywood County22.9Smith County: 22.7 %Smith County22.7Lewis County: 22.7 %Lewis County22.7Dickson County: 22.7 %Dickson County22.7Union County: 22.6 %Union County22.6Humphreys County: 22.5 %Humphreys County22.5Henderson County: 22.5 %Henderson County22.5Lincoln County: 22.3 %Lincoln County22.3White County: 22.1 %White County22.1Rhea County: 22.1 %Rhea County22.1Lauderdale County: 22.1 %Lauderdale County22.1Madison County: 22 %Madison County22DeKalb County: 22 %DeKalb County22Bradley County: 22 %Bradley County22Chester County: 21.9 %Chester County21.9Obion County: 21.7 %Obion County21.7Overton County: 21.7 %Overton County21.7Cheatham County: 21.6 %Cheatham County21.6Hancock County: 21.5 %Hancock County21.5Cannon County: 21.5 %Cannon County21.5Williamson County: 27.7 %Williamson County27.7Montgomery County: 27.1 %Montgomery County27.1Rutherford County: 25.3 %Rutherford County25.3Bedford County: 25.2 %Bedford County25.2Tipton County: 24.7 %Tipton County24.7Lawrence County: 24.5 %Lawrence County24.5Scott County: 24.5 %Scott County24.5Macon County: 24.3 %Macon County24.3Shelby County: 24.2 %Shelby County24.2Dyer County: 24.2 %Dyer County24.2Gibson County: 24 %Gibson County24Sumner County: 23.9 %Sumner County23.9Robertson County: 23.8 %Robertson County23.8Wilson County: 23.8 %Wilson County23.8Crockett County: 23.4 %Crockett County23.4Marshall County: 23.3 %Marshall County23.3Warren County: 23.2 %Warren County23.2Hamblen County: 23.2 %Hamblen County23.2Maury County: 23.1 %Maury County23.1Coffee County: 23 %Coffee County23Haywood County: 22.9 %Haywood County22.9Smith County: 22.7 %Smith County22.7Lewis County: 22.7 %Lewis County22.7Dickson County: 22.7 %Dickson County22.7Union County: 22.6 %Union County22.6Humphreys County: 22.5 %Humphreys County22.5Henderson County: 22.5 %Henderson County22.5Lincoln County: 22.3 %Lincoln County22.3White County: 22.1 %White County22.1Rhea County: 22.1 %Rhea County22.1Lauderdale County: 22.1 %Lauderdale County22.1Madison County: 22 %Madison County22DeKalb County: 22 %DeKalb County22Bradley County: 22 %Bradley County22Chester County: 21.9 %Chester County21.9Obion County: 21.7 %Obion County21.7Overton County: 21.7 %Overton County21.7Cheatham County: 21.6 %Cheatham County21.6Hancock County: 21.5 %Hancock County21.5Cannon County: 21.5 %Cannon County21.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Williamson County27.7-0.3 pts
2Montgomery County27.1-0 pts
3Rutherford County25.3-0 pts
4Bedford County25.2-0.2 pts
5Tipton County24.7-0.3 pts
6Lawrence County24.5-0.2 pts
7Scott County24.5-0.2 pts
8Macon County24.3-0.3 pts
9Shelby County24.2-0.2 pts
10Dyer County24.2-0.1 pts
11Gibson County24-0.2 pts
12Sumner County23.9-0.1 pts
13Robertson County23.8-0.3 pts
14Wilson County23.8-0.2 pts
15Crockett County23.4-0.2 pts
16Marshall County23.3-0.4 pts
17Warren County23.2-0.1 pts
18Hamblen County23.2-0.1 pts
19Maury County23.1-0.2 pts
20Coffee County23-0 pts
21Haywood County22.9+0.1 pts
22Smith County22.7-0.1 pts
23Lewis County22.7+0.4 pts
24Dickson County22.7-0.2 pts
25Union County22.6-0 pts
26Humphreys County22.5+0.1 pts
27Henderson County22.5-0.1 pts
28Lincoln County22.3-0 pts
29White County22.1-0.1 pts
30Rhea County22.1-0.4 pts
31Lauderdale County22.1-0.4 pts
32Madison County22-0.2 pts
33DeKalb County22-0 pts
34Bradley County22-0 pts
35Chester County21.9-0.3 pts
36Obion County21.7-0 pts
37Overton County21.7+0.1 pts
38Cheatham County21.6-0.2 pts
39Hancock County21.5+0.2 pts
40Cannon County21.5-0 pts
41Van Buren County21.2+0.4 pts
42Perry County21.2+0.1 pts
43Houston County21.2-0.5 pts
44Monroe County21.2-0.2 pts
45McMinn County21.2-0.2 pts
46Stewart County21.2+0.1 pts
47Anderson County21.10 pts
48Knox County21.1-0.1 pts
49Hamilton County21.1-0.1 pts
50McNairy County21-0.3 pts
51Putnam County21-0 pts
52Giles County20.9-0.2 pts
52Sequatchie County20.9-0.2 pts
54Henry County20.80 pts
55Carroll County20.8+0.1 pts
56Moore County20.8+0.1 pts
57Grundy County20.8-0.4 pts
58Hickman County20.7-0.2 pts
59Fentress County20.7-0.4 pts
60Meigs County20.6-0.4 pts
61Grainger County20.6-0.2 pts
62Blount County20.5-0.3 pts
63Marion County20.5-0.2 pts
64Campbell County20.4-0.2 pts
65Hardin County20.4-0.1 pts
65Sevier County20.4-0.2 pts
67Davidson County20.3-0.3 pts
68Clay County20.3-0.2 pts
69Hawkins County20.1-0.2 pts
70Jefferson County20.1-0.3 pts
71Decatur County20-0.5 pts
72Greene County19.8-0 pts
73Franklin County19.7-0.3 pts
74Cocke County19.7-0.1 pts
75Morgan County19.7-0.2 pts
76Benton County19.6-0.3 pts
76Weakley County19.6+0.1 pts
78Roane County19.4-0.1 pts
79Sullivan County19.2-0.2 pts
80Fayette County19.2-0.4 pts
81Claiborne County19.2-0.1 pts
82Washington County19.1-0.1 pts
83Polk County19-0.4 pts
84Pickett County18.8-0.5 pts
85Loudon County18.7-0.1 pts
86Carter County18.7-0.3 pts
87Hardeman County18.5-0.4 pts
88Jackson County18.4-0.1 pts
89Unicoi County18.3-0.1 pts
90Trousdale County18.2+0.4 pts
91Wayne County18.1-0.1 pts
92Johnson County17.6+0.1 pts
93Bledsoe County17.4-0.3 pts
94Cumberland County17.4-0.2 pts
95Lake County15+0.4 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 Tennessee 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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_tennessee_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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/tennessee-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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Rank Counties in Tennessee by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Williamson County, with 27.7% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lake County, with 15% 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 Tennessee: more rankings