How O'Brien County Compares

O'Brien County

39.5 years

Iowa Average

39.5 years

Rank #76 of 99 in state

National

38.9 years

1.5% above

National Distribution

Where O'Brien County falls among all 3,222 U.S. counties for median age.

21.4 years 86.2 years

■ O'Brien County: 39.5 years

Ranking Context

Rank	County	Value
#2,253	Spalding County, GA	39.5 years
#2,254	Kalawao County, HI	39.5 years
#2,255	Jay County, IN	39.5 years
#2,256	O'Brien County, IA	39.5 years
#2,257	Boyle County, KY	39.5 years
#2,258	Meade County, KY	39.5 years
#2,259	Nelson County, KY	39.5 years

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Median Age in O'Brien County, Iowa

O'Brien County, Iowa has a median age of 39.5 years, which ranks #2,256 of 3,222 out of 3,222 counties nationwide. This is 1.5% above the national value of 38.9 years.

Within Iowa, O'Brien County ranks #76 of 99 out of 99 counties. This places it in the 30th percentile nationally.

The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.

About this data

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.