Middlesex County, CT Population by Year

In 2021, the population of Middlesex County was 164,759, a 0.51% increase year-by-year from 2020. Previously, in 2020, Middlesex County's population was 163,923, an increase of 0.85% compared to a population of 162,538 in 2019.
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Updated Sep 18, 2023

Middlesex County, CT population between 2000 and 2021

Over the last 20 plus years, between 2000 and 2021, population of Middlesex County increased by 9,104. In this period, the peak population was 166,513 in the year 2009. The numbers suggest that the population has already reached its peak and is showing a trend of decline.

Year Population Year on Year Change Change in Percent
2000 155,655 - -
2001 157,207 1,552 1%
2002 159,522 2,315 1.47%
2003 161,322 1,800 1.13%
2004 162,038 716 0.44%
2005 162,856 818 0.5%
2006 164,216 1,360 0.84%
2007 164,943 727 0.44%
2008 165,829 886 0.54%
2009 166,513 684 0.41%
2010 165,624 -889 -0.53%
2011 166,199 575 0.35%
2012 165,677 -522 -0.31%
2013 165,390 -287 -0.17%
2014 164,857 -533 -0.32%
2015 163,809 -1,048 -0.64%
2016 163,403 -406 -0.25%
2017 163,058 -345 -0.21%
2018 163,053 -5 -
2019 162,538 -515 -0.32%
2020 163,923 1,385 0.85%
2021 164,759 836 0.51%
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Middlesex County, CT population from 2000 to 2021

From 2000 to 2010, Middlesex County's population increased by 9,969 (6.40%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 9.63%.

From 2010 to 2020, Middlesex County's population decreased by 1,701 (1.03%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.

The graph shows Middlesex County's population from 2000 to 2021, with years on x-axis and population on y-axis
Middlesex County's population from 2000 to 2021. The estimated population at the end of 2021 was 164,759. Source: U.S. Census Bureau (Population Estimates Program)

Between the year 2000 and 2021, Middlesex County's population peaked in year 2009 at 166,513.

Between the year 2000 and 2021, Middlesex County's population was lowest in year 2000 at 155,655.

Middlesex County, CT annual population growth rate

Between the years 2000 and 2021, i.e. 21 annual cycles, the population of Middlesex County grew year by year for 12 years and declined for 9 years.

From 2000 to 2021, Middlesex County had an average annual population growth rate of 0.28% per year. Overall the population grew 5.85% between 2000 and 2021.

The graph shows Middlesex County's annual population change from 2000 to 2021, with years on x-axis and population annual growth on y-axis
Middlesex County's annual population change from 2000 to 2021. The average annual growth rate from 2000 to 2021 was 0.28% per year. In the last two years, the population grew by 2,221. Source: U.S. Census Bureau (Population Estimates Program)

From 2001 to 2002, Middlesex County's population grew the most with an increase of 2,315 (1.47%).

While from 2014 and 2015, Middlesex County's population declined the most with a negative growth of 1,048 (-0.64%).

Things to know

Is Middlesex County, CT population increasing or decreasing?

According to the latest data from U.S. Census Bureau's population estimates, Middlesex County's population increased by 2,221 between 2019 and 2021. The increase was 1,385 (0.85%) between 2019 and 2020; and increase of 836 (0.51%) between 2020 and 2021.

How has the population of Middlesex County, CT changed in the last 10 years?

Between 2011 and 2021, population of Middlesex County decreased by 918 (0.55%). The population was highest at 165,677 in the year 2012 and lowest at 162,538 in the year 2019. Overall the average growth rate witnessed for the last 10 years was -0.09%.

References

Datasets

Explore datasets by year of publication.
2023
Middlesex County, CT Population Dataset: Yearly Figures, Population Change, and Percent Change Analysis
Last updated September 18, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the Middlesex County population over the last 20 plus years. It lists the population for each year, along with the year on year change in population, as well as the change in percentage terms for each year. The dataset can be utilized to understand the population change of Middlesex County across the last two decades. For example, using this dataset, we can identify if the population is declining or increasing. If there is a change, when the population peaked, or if it is still growing and has not reached its peak. We can also compare the trend with the overall trend of United States population over the same period of time.

Key observations

In 2021, the population of Middlesex County was 164,759, a 0.51% increase year-by-year from 2020. Previously, in 2020, Middlesex County population was 163,923, an increase of 0.85% compared to a population of 162,538 in 2019. Over the last 20 plus years, between 2000 and 2021, population of Middlesex County increased by 9,104. In this period, the peak population was 166,513 in the year 2009. The numbers suggest that the population has already reached its peak and is showing a trend of decline. Source: U.S. Census Bureau Population Estimates Program (PEP).

Middlesex County population by year

Content

When available, the data consists of estimates from the U.S. Census Bureau Population Estimates Program (PEP).

Data Coverage:

  • From 2000 to 2021

Variables / Data Columns

  • Year: This column displays the data year (Measured annually and for years 2000 to 2021)
  • Population: The population for the specific year for the Middlesex County is shown in this column.
  • Year on Year Change: This column displays the change in Middlesex County population for each year compared to the previous year.
  • Change in Percent: This column displays the year on year change as a percentage. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for Middlesex County Population by Year. You can refer the same here

If you're looking for datasets from another year, please feel free to contact us at research@neilsberg.com and we'll be happy to assist you further.

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Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

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