With the completion of the United States 2020 Census, Marion's official population is 41,535  This is an official increase of 6,767 people since the 2010 US Census.  Marion's most recent estimated population is 41,703 as of July 1, 2021.

Population Estimate Reports:

The Planning & Development Division compiles population estimates with data provided from the United States Census and the State Data Center of Iowa.  The estimates are updated in July of every year for the previous year estimates.

• 2022 Census Population Estimates Report (prepared June 12, 2023)
  
• 2021 Census Population Estimates Report (prepared June 6, 2022)
• 2020 Census Population Estimate Report (Not prepared due to 2020 US Census)
• 2019 Census Population Estimate Report (prepared May 21, 2020)
• 2018 Census Population Estimate Report (prepared May 23, 2019)
• 2017 Census Population Estimate Report (prepared May 24, 2018)
• 2016 Census Population Estimate Report (prepared May 25, 2017)
• 2015 Census Population Estimate Report (prepared May 20, 2016)
• 2014 Census Population Estimate Report (prepared May 21, 2015)
• 2013 Census Population Estimate Report (prepared June 1, 2014)
• 2012 Census Population Estimate Report (prepared July 1, 2013)
• 2011 Census Population Estimate Report (prepared June 28, 2012

Additional Resources:

• US Census Bureau -  The US Census Bureau is a principal agency of the U.S. Federal Statistical System responsible for producing data about the American people and economy.

• Iowa Data Center - The State Data Center of Iowa is your source for population, housing, business and government statistics about Iowa, including data from the U.S. Census Bureau, Iowa state agencies, and other state and federal sources.

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