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Population Estimate, Total (5-year estimate) in Montgomery County, IL (B03002001E017135)

Observations

2024: 27,942
Updated: Jan 29, 2026 3:34 PM CST
2024:  27,942  
2023:  28,078  
2022:  28,352  
2021:  28,482  
2020:  28,598  

Units:

Persons,
Not Seasonally Adjusted

Frequency:

Annual

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Notes

Title Release Dates
Population Estimate, Total (5-year estimate) in Montgomery County, IL 2018-12-06 2026-01-29
 
Source    
U.S. Census Bureau 2018-12-06 2026-01-29
 
Release    
County Population Estimates By Race And Ethnicity 2018-12-06 2026-01-29
 
Units    
Persons 2018-12-06 2026-01-29
 
Frequency    
Annual 2018-12-06 2026-01-29
 
Seasonal Adjustment    
Not Seasonally Adjusted 2018-12-06 2026-01-29
 
Notes    
Data obtained from ACS Demographic and Housing Estimates, table DP05.

Multiyear estimates from the American Community Survey (ACS) are "period" estimates derived from a data sample collected over a period of time, as opposed to "point-in-time" estimates such as those from past decennial censuses. ACS 5-year estimate includes data collected over a 60-month period. The date of the data is the end of the 5-year period. For example, a value dated 2014 represents data from 2010 to 2014. However, they do not describe any specific day, month, or year within that time period.

Multiyear estimates require some considerations that single-year estimates do not. For example, multiyear estimates released in consecutive years consist mostly of overlapping years and shared data. The 2010-2014 ACS 5-year estimates share sample data from 2011 through 2014 with the 2011-2015 ACS 5-year estimates. Because of this overlap, users should use extreme caution in making comparisons with consecutive years of multiyear estimates.

Please see "Section 3: Understanding and Using ACS Single-Year and Multiyear Estimates" on publication page 13 (file page 19) of the 2018 ACS General Handbook (https://www.census.gov/content/dam/Census/library/publications/2018/acs/acs_general_handbook_2018.pdf) for a more thorough clarification.

2018-12-06 2026-01-29

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Montgomery County, IL Illinois Estimate American Community Survey 5-Year Persons Population County or County Equivalent Census Annual Public Domain: Citation Requested United States of America Not Seasonally Adjusted