Data updated April 2026 - Source: Zillow Research
About O'Brien
The most populated towns are Floyd, Hartley, and Franklin.
Data comes from public sources including the U.S. Census Bureau, the National Center for Education Statistics, the FBI, the EPA, Zillow, and Redfin. Source attribution is shown on each metric.
Towns in O'Brien
16 towns, by population.
O'Brien at a glance: frequently asked questions
- What state is O'Brien in?
- O'Brien is in Iowa.
- How many towns are in O'Brien?
- O'Brien contains 16 towns and municipalities. Click any town below or on the map to see its housing, school, and crime data.
Compare O'Brien with other places
Put up to four states, counties, towns, or ZIPs side by side on income, housing, crime, education, and more.
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