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Estimate, Median Age by Sex, Total Population (5-year estimate) in Contra Costa County, CA (B01002001E006013)

Observations

2024: 40.5
Updated: Jan 29, 2026 10:00 AM CST
2024:  40.5  
2023:  40.3  
2022:  40.1  
2021:  39.9  
2020:  39.9  

Units:

Years of Age,
Not Seasonally Adjusted

Frequency:

Annual

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Notes

Title Release Dates
Estimate, Median Age by Sex, Total Population (5-year estimate) in Contra Costa County, CA 2017-05-17 2026-01-29
 
Source    
U.S. Census Bureau 2017-05-17 2026-01-29
 
Release    
County Median Age 2017-05-17 2026-01-29
 
Units    
Years of Age 2017-05-17 2026-01-29
 
Frequency    
Annual 2017-05-17 2026-01-29
 
Seasonal Adjustment    
Not Seasonally Adjusted 2017-05-17 2026-01-29
 
Notes    
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.

2017-05-17 2026-01-29

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Contra Costa County, CA San Francisco Age California Median 5-Year Census County or County Equivalent Annual Public Domain: Citation Requested United States of America Not Seasonally Adjusted