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 2018, at 28.1%. Lake County had the lowest, at 14.6%. The median was 21.1% and the figure for Tennessee was 22.4%. Source: the U.S. Census Bureau.

Highest28.1Williamson County
Lowest14.6Lake County
Median21.195 counties
Tennessee22.4History

Top 40 counties, 2018

Williamson County: 28.1 %Williamson County28.1Montgomery County: 27.1 %Montgomery County27.1Bedford County: 25.3 %Bedford County25.3Rutherford County: 25.3 %Rutherford County25.3Tipton County: 25 %Tipton County25Scott County: 24.7 %Scott County24.7Lawrence County: 24.7 %Lawrence County24.7Macon County: 24.6 %Macon County24.6Shelby County: 24.4 %Shelby County24.4Dyer County: 24.2 %Dyer County24.2Gibson County: 24.2 %Gibson County24.2Robertson County: 24.1 %Robertson County24.1Sumner County: 24 %Sumner County24Wilson County: 23.9 %Wilson County23.9Marshall County: 23.8 %Marshall County23.8Crockett County: 23.6 %Crockett County23.6Warren County: 23.3 %Warren County23.3Hamblen County: 23.3 %Hamblen County23.3Maury County: 23.2 %Maury County23.2Coffee County: 23 %Coffee County23Smith County: 22.9 %Smith County22.9Dickson County: 22.9 %Dickson County22.9Haywood County: 22.8 %Haywood County22.8Union County: 22.7 %Union County22.7Henderson County: 22.7 %Henderson County22.7Rhea County: 22.5 %Rhea County22.5Humphreys County: 22.5 %Humphreys County22.5Lauderdale County: 22.4 %Lauderdale County22.4Lincoln County: 22.3 %Lincoln County22.3Lewis County: 22.3 %Lewis County22.3White County: 22.2 %White County22.2Madison County: 22.2 %Madison County22.2Chester County: 22.2 %Chester County22.2DeKalb County: 22 %DeKalb County22Bradley County: 22 %Bradley County22Obion County: 21.8 %Obion County21.8Cheatham County: 21.8 %Cheatham County21.8Houston County: 21.7 %Houston County21.7Overton County: 21.5 %Overton County21.5Cannon County: 21.5 %Cannon County21.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Williamson County28.1-0.2 pts
2Montgomery County27.1-0.1 pts
3Bedford County25.3-0.1 pts
4Rutherford County25.3-0 pts
5Tipton County25-0.2 pts
6Scott County24.7-0 pts
7Lawrence County24.7-0.2 pts
8Macon County24.6+0.1 pts
9Shelby County24.4-0.2 pts
10Dyer County24.2-0.1 pts
11Gibson County24.2-0.3 pts
12Robertson County24.1-0.3 pts
13Sumner County24-0.1 pts
14Wilson County23.9-0.1 pts
15Marshall County23.8-0.1 pts
16Crockett County23.6-0.4 pts
17Warren County23.3-0.3 pts
18Hamblen County23.3-0 pts
19Maury County23.2-0.2 pts
20Coffee County23-0.1 pts
21Smith County22.9-0.4 pts
22Dickson County22.9-0.3 pts
23Haywood County22.8-0.3 pts
24Union County22.7-0.1 pts
25Henderson County22.7-0.1 pts
26Rhea County22.5-0.1 pts
27Humphreys County22.5-0.1 pts
28Lauderdale County22.4-0.6 pts
29Lincoln County22.3-0 pts
30Lewis County22.3+0.2 pts
31White County22.20 pts
32Madison County22.2-0.2 pts
33Chester County22.2-0.2 pts
34DeKalb County22-0.2 pts
35Bradley County22-0.1 pts
36Obion County21.8-0.2 pts
37Cheatham County21.8-0.6 pts
38Houston County21.7-0.3 pts
39Overton County21.5-0.3 pts
40Cannon County21.5+0.3 pts
41McMinn County21.4-0.1 pts
42McNairy County21.4-0.3 pts
43Monroe County21.4-0.3 pts
44Hancock County21.3-0.2 pts
45Knox County21.2-0.1 pts
46Grundy County21.2-0.3 pts
47Hamilton County21.1-0 pts
48Perry County21.1+0.2 pts
49Sequatchie County21.1-0.3 pts
49Stewart County21.10 pts
51Giles County21.1-0.1 pts
52Anderson County21.1-0.1 pts
53Fentress County21.1-0.2 pts
54Putnam County21-0.1 pts
55Meigs County21-0.3 pts
56Hickman County20.9-0.3 pts
57Henry County20.8-0.1 pts
58Van Buren County20.8+0.3 pts
59Grainger County20.8-0.2 pts
60Blount County20.7-0.1 pts
61Carroll County20.7-0.1 pts
62Campbell County20.7-0.1 pts
63Marion County20.6-0.2 pts
64Moore County20.6-0.1 pts
65Davidson County20.6-0.3 pts
66Sevier County20.5-0.2 pts
67Decatur County20.5-0.2 pts
68Hardin County20.5-0.1 pts
69Clay County20.40 pts
70Jefferson County20.4-0.3 pts
71Hawkins County20.3-0.3 pts
72Franklin County20-0.2 pts
73Morgan County19.9-0.2 pts
74Benton County19.9+0.6 pts
75Greene County19.9-0.1 pts
76Cocke County19.8-0.2 pts
77Roane County19.60 pts
78Fayette County19.6-0.7 pts
79Weakley County19.5-0.2 pts
80Polk County19.4-0.3 pts
81Sullivan County19.4-0.2 pts
82Pickett County19.3-0.2 pts
83Claiborne County19.3+0.1 pts
84Washington County19.2-0.2 pts
85Carter County18.9-0.3 pts
86Hardeman County18.9-0.3 pts
87Loudon County18.8-0.4 pts
88Jackson County18.5-0 pts
89Unicoi County18.4-0.2 pts
90Wayne County18.2-0.2 pts
91Bledsoe County17.7-0.2 pts
91Trousdale County17.7-0.1 pts
93Cumberland County17.6-0.3 pts
94Johnson County17.5+0.2 pts
95Lake County14.6-0.5 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 Tennessee 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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_tennessee_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 Tennessee 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/tennessee-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 Tennessee 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/tennessee-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/tennessee-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?

Williamson County, with 28.1% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Lake County, with 14.6% 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 Tennessee: more rankings