St. Clair County, IL Population by Year

In 2022, the population of St. Clair County was 252,671, a 0.92% decrease year-by-year from 2021. Previously, in 2021, St. Clair County's population was 255,022, a decline of 0.70% compared to a population of 256,823 in 2020.
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Updated Sep 18, 2023

St. Clair County, IL population between 2000 and 2022

Over the last 20 plus years, between 2000 and 2022, population of St. Clair County decreased by 3,627. In this period, the peak population was 270,368 in the year 2010. 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 256,298 - -
2001 255,657 -641 -0.25%
2002 256,332 675 0.26%
2003 256,068 -264 -0.1%
2004 257,049 981 0.38%
2005 257,315 266 0.1%
2006 258,662 1,347 0.52%
2007 259,257 595 0.23%
2008 260,139 882 0.34%
2009 261,202 1,063 0.41%
2010 270,368 9,166 3.51%
2011 270,097 -271 -0.1%
2012 268,748 -1,349 -0.5%
2013 266,934 -1,814 -0.67%
2014 266,061 -873 -0.33%
2015 265,008 -1,053 -0.4%
2016 263,482 -1,526 -0.58%
2017 262,881 -601 -0.23%
2018 261,631 -1,250 -0.48%
2019 259,889 -1,742 -0.67%
2020 256,823 -3,066 -1.18%
2021 255,022 -1,801 -0.7%
2022 252,671 -2,351 -0.92%
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St. Clair County, IL population from 2000 to 2022

From 2000 to 2010, St. Clair County's population increased by 14,070 (5.49%), 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, St. Clair County's population decreased by 13,545 (5.01%), 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 St. Clair County's population from 2000 to 2022, with years on x-axis and population on y-axis
St. Clair County's population from 2000 to 2022. The estimated population at the end of 2022 was 252,671. Source: U.S. Census Bureau (Population Estimates Program)

Between the year 2000 and 2022, St. Clair County's population peaked in year 2010 at 270,368.

Between the year 2000 and 2022, St. Clair County's population was lowest in year 2022 at 252,671.

St. Clair County, IL annual population growth rate

Between the years 2000 and 2022, i.e. 22 annual cycles, the population of St. Clair County grew year by year for 8 years and declined for 14 years.

From 2000 to 2022, St. Clair County had an average annual population growth rate of -0.06% per year. Overall the population shrank 1.42% between 2000 and 2022.

The graph shows St. Clair County's annual population change from 2000 to 2022, with years on x-axis and population annual growth on y-axis
St. Clair County's annual population change from 2000 to 2022. The average annual growth rate from 2000 to 2022 was -0.06% per year. In the last two years, the population declined by 4,152. Source: U.S. Census Bureau (Population Estimates Program)

From 2009 to 2010, St. Clair County's population grew the most with an increase of 9,166 (3.51%).

While from 2019 and 2020, St. Clair County's population declined the most with a negative growth of 3,066 (-1.18%).

Things to know

Is St. Clair County, IL population increasing or decreasing?

According to the latest data from U.S. Census Bureau's population estimates, St. Clair County's population decreased by 4,152 between 2020 and 2022. The decrease was 1,801 (0.70%) between 2020 and 2021; and decrease of 2,351 (0.92%) between 2021 and 2022.

How has the population of St. Clair County, IL changed in the last 10 years?

Between 2012 and 2022, population of St. Clair County decreased by 14,263 (5.34%). The population was highest at 266,934 in the year 2013 and lowest at 252,671 in the year 2022. Overall the average growth rate witnessed for the last 10 years was -0.61%.

References

Datasets

Explore datasets by year of publication.
2023
St. Clair County, IL 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 St. Clair 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 St. Clair 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 2022, the population of St. Clair County was 252,671, a 0.92% decrease year-by-year from 2021. Previously, in 2021, St. Clair County population was 255,022, a decline of 0.70% compared to a population of 256,823 in 2020. Over the last 20 plus years, between 2000 and 2022, population of St. Clair County decreased by 3,627. In this period, the peak population was 270,368 in the year 2010. 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).

St. Clair 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 2022

Variables / Data Columns

  • Year: This column displays the data year (Measured annually and for years 2000 to 2022)
  • Population: The population for the specific year for the St. Clair County is shown in this column.
  • Year on Year Change: This column displays the change in St. Clair 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 St. Clair 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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