Data / Population under 18 / Southeastern Connecticut Planning Region

Population under 18 in Southeastern Connecticut Planning Region

Population under 18 in Southeastern Connecticut Planning Region was 18% in 2025, according to the U.S. Census Bureau. That is down 0.3 pts from 2024. That is the 7th highest of 9 counties in 2025.

202518%
Change on 2024-0.3 pts
Rank7th of 9Counties in Connecticut ranked
Series high19.32020
Series low182025

Next release: Friday, 25 June 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Population under 18 in Southeastern Connecticut Planning Region, 2020 to 2025

17.51818.51919.52020202120222023202420252020: 19.3 %2021: 19 %2022: 18.8 %2023: 18.6 %2024: 18.3 %2025: 18 %17.51818.51919.52020202220252020: 19.3 %2021: 19 %2022: 18.8 %2023: 18.6 %2024: 18.3 %2025: 18 %
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12, published 2026-06-25.
All 6 values
Period%
202518
202418.3
202318.6
202218.8
202119
202019.3

Compared with Connecticut and United States

Place2025
Southeastern Connecticut Planning Region18
Connecticut19.5
United States21.1

Southeastern Connecticut Planning Region compared with nearby places

Capitol Planning Region: 19.3 %Greater Bridgeport Planning Region: 21.6 %Lower Connecticut River Valley Planning Region: 15.9 %Naugatuck Valley Planning Region: 19.8 %Northeastern Connecticut Planning Region: 18.7 %Northwest Hills Planning Region: 17.2 %South Central Connecticut Planning Region: 18.6 %Southeastern Connecticut Planning Region: 18 %Western Connecticut Planning Region: 21.3 %
  • Under 18
  • 18 to 19
  • 19 to 20
  • 20 and over
Population under 18, 2025, %. Southeastern Connecticut Planning Region is outlined. Same source and period for every area shown. Source: U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025) [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, Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/en/population-under-18/southeastern-connecticut-planning-region-connecticut. 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. Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/en/population-under-18/southeastern-connecticut-planning-region-connecticut.

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, Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/en/population-under-18/southeastern-connecticut-planning-region-connecticut (Accessed: 12 October 2026).

BibTeX
@misc{census_population_under_18_southeastern_2025,
  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: Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025}},
  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/en/population-under-18/southeastern-connecticut-planning-region-connecticut. 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: Population under 18, Southeastern Connecticut Planning Region, 2020 to 2025
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/en/population-under-18/southeastern-connecticut-planning-region-connecticut
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/population-under-18/southeastern-connecticut-planning-region-connecticut.
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

What is the population under 18 in Southeastern Connecticut Planning Region?

Population under 18 in Southeastern Connecticut Planning Region was 18% in 2025, according to the U.S. Census Bureau. That is down 0.3 pts from 2024. That is the 7th highest of 9 counties in 2025.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest population under 18 in Southeastern Connecticut Planning Region?

19.3% in 2020, the highest value since 2020 in this series.

Related statistics for Southeastern Connecticut Planning Region

All statistics for Southeastern Connecticut Planning Region | Southeastern Connecticut Planning Region in figures