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Where am ILOCATED

O'Brien County, Iowa

O'Brien County, Iowa, has 14,220 residents (July 2025 estimate). Its county seat is Primghar. It uses Central Time and covers 573 sq mi (1,484 km²) of land.

Des MoinesCedar RapidsDavenport
O'Brien County in Iowa
SheldonHartleySanbornPrimgharPaullina
O'Brien County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
14,220
Land area
573 sq mi (1,484 km²)
County seat or government
Primghar
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$68,356 ± $4,388
Median home value
$173,100 ± $9,272
Median rent, with utilities
$868 ± $94
Homes lived in by their owners
76.1% ± 3.3 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Spencer, IA micro area, Spirit Lake, IA micro area, Le Mars, IA micro area, and Storm Lake, IA micro area
Water area
0.17 sq mi (0.45 km²)
State
Iowa
County code (FIPS)
19141
Coordinates (central point)
43.083746, -95.625624
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in O'Brien County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 512016,430 people
  2. 513462,247 people
  3. 512481,534 people
  4. 512381,502 people
  5. 512451,377 people
  6. 510461,326 people
  7. 510581,096 people
  8. 51022960 people
  9. 51047693 people
  10. 51232658 people
  11. 51231562 people
  12. 51350383 people
All 14
  1. 51029261 people
  2. 51009113 people

14 ZIP Code areas overlap O'Brien County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in O'Brien County, largest first

  1. Floyd Township5,503 people
  2. Hartley Township1,873 people
  3. Franklin Township1,373 people
  4. Union Township999 people
  5. Waterman Township877 people
  6. Carroll Township824 people
  7. Summit Township602 people
  8. Dale Township451 people
  9. Highland Township312 people
  10. Center Township302 people
  11. Caledonia Township288 people
  12. Liberty Township235 people
All 16
  1. Baker Township165 people
  2. Omega Township153 people
  3. Grant Township108 people
  4. Lincoln Township61 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Iowa, by county

School districts in O'Brien County, largest first

  1. MOC-Floyd Valley Community School District11,239 people
  2. Sheldon Community School District7,946 people
  3. South O'Brien Community School District4,136 people
  4. Hartley-Melvin-Sanborn Community School District4,073 people
  5. Sioux Central Community School District2,499 people
  6. Clay Central-Everly Community School District2,237 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Sheldon, Iowa (city)5,474 people
  2. Hartley, Iowa (city)1,553 people
  3. Sanborn, Iowa (city)1,323 people
  4. Primghar, Iowa (city)1,014 people
  5. Paullina, Iowa (city)869 people
  6. Sutherland, Iowa (city)629 people
  7. Archer, Iowa (city)130 people
  8. Calumet, Iowa (city)113 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Osceola County, Iowa20 mi north
  2. Cherokee County, Iowa24 mi south
  3. Clay County, Iowa24 mi east
  4. Sioux County, Iowa28 mi west
  5. Dickinson County, Iowa30 mi northeast
  6. Buena Vista County, Iowa34 mi southeast
  7. Lyon County, Iowa36 mi northwest
  8. Plymouth County, Iowa38 mi southwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.