Data / Rankings / Graduate or professional degree, population 25 and over / Counties in Connecticut

Counties in Connecticut by graduate or professional degree, population 25 and over, 2024

Western Connecticut Planning Region had the highest graduate or professional degree, population 25 and over of 9 counties in 2024, at 25.4%. Northeastern Connecticut Planning Region had the lowest, at 11.7%. The median was 18% and the figure for Connecticut was 19.2%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest25.4Western Connecticut Planning Region
Lowest11.7Northeastern Connecticut Planning Region
Median189 counties
Connecticut19.2History

Map of counties, 2024

Capitol Planning Region: 18.8 %Greater Bridgeport Planning Region: 18 %Lower Connecticut River Valley Planning Region: 20.7 %Naugatuck Valley Planning Region: 14.5 %Northeastern Connecticut Planning Region: 11.7 %Northwest Hills Planning Region: 17 %South Central Connecticut Planning Region: 20.3 %Southeastern Connecticut Planning Region: 16 %Western Connecticut Planning Region: 25.4 %
  • Under 15
  • 15 to 17
  • 17 to 19
  • 19 to 20
  • 20 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

Western Connecticut Planning Region: 25.4 %Western Connecticut Planning Regi…25.4Lower Connecticut River Valley Planning Region: 20.7 %Lower Connecticut River Valley Pl…20.7South Central Connecticut Planning Region: 20.3 %South Central Connecticut Plannin…20.3Capitol Planning Region: 18.8 %Capitol Planning Region18.8Greater Bridgeport Planning Region: 18 %Greater Bridgeport Planning Region18Northwest Hills Planning Region: 17 %Northwest Hills Planning Region17Southeastern Connecticut Planning Region: 16 %Southeastern Connecticut Planning…16Naugatuck Valley Planning Region: 14.5 %Naugatuck Valley Planning Region14.5Northeastern Connecticut Planning Region: 11.7 %Northeastern Connecticut Planning…11.7Western Connecticut Planning Region: 25.4 %Western Connecticut Planning Region25.4Lower Connecticut River Valley Planning Region: 20.7 %Lower Connecticut River Valley Planning Region20.7South Central Connecticut Planning Region: 20.3 %South Central Connecticut Planning Region20.3Capitol Planning Region: 18.8 %Capitol Planning Region18.8Greater Bridgeport Planning Region: 18 %Greater Bridgeport Planning Region18Northwest Hills Planning Region: 17 %Northwest Hills Planning Region17Southeastern Connecticut Planning Region: 16 %Southeastern Connecticut Planning Region16Naugatuck Valley Planning Region: 14.5 %Naugatuck Valley Planning Region14.5Northeastern Connecticut Planning Region: 11.7 %Northeastern Connecticut Planning Region11.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Western Connecticut Planning Region25.4+0.2 pts
2Lower Connecticut River Valley Planning Region20.7+0.5 pts
3South Central Connecticut Planning Region20.3+0.5 pts
4Capitol Planning Region18.8+0.2 pts
5Greater Bridgeport Planning Region180 pts
6Northwest Hills Planning Region17+0.2 pts
7Southeastern Connecticut Planning Region16+0.6 pts
8Naugatuck Valley Planning Region14.5-0.4 pts
9Northeastern Connecticut Planning Region11.7+0.5 pts

Other periods

About this ranking

People aged 25 and over whose highest degree is a master's, professional school or doctorate degree, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

A subset of bachelors_degree_share, which also counts people whose highest degree is a bachelor's.

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. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. 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). American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Connecticut by graduate or professional degree, population 25 and over, 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Connecticut by graduate or professional degree, population 25 and over, 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Connecticut by graduate or professional degree, population 25 and over, 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Connecticut by graduate or professional degree, population 25 and over, 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat, via Invokely: https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_connecticut_by_2024,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Connecticut by graduate or professional degree, population 25 and over, 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Connecticut by graduate or professional degree, population 25 and over, 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat
L2  - https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/connecticut-counties.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Connecticut by graduate or professional degree, population 25 and over using official data, and cite the source.
rank_places {"indicator":"graduate_degree_share","level":"province","within":"Connecticut","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=graduate_degree_share&level=province&within=Connecticut&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest graduate or professional degree, population 25 and over?

Western Connecticut Planning Region, with 25.4% in 2024, according to the U.S. Census Bureau.

Which county has the lowest graduate or professional degree, population 25 and over?

Northeastern Connecticut Planning Region, with 11.7% in 2024.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

Graduate or professional degree, population 25 and over: other rankings

Counties in Connecticut: more rankings