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Zip Code 51231 — Archer, IA

ZIP Code 51231 is associated with Archer, IA, in O'Brien County. The listed population estimate is 562; estimated density is 9.0 people per square mile. Among records with population estimates, it ranks #7 of 8 in O'Brien County and #644 of 969 in IA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (43.105670, -95.741310)

Data MetricLocal Statistic
Postal / Zip Code51231
Primary CityArcher
State / ProvinceIA
CountyO'Brien
Total Population562
Population Density9.0 people/sq mi
TimezoneAmerica/Chicago

How 51231 Compares

MetricZIP 51231O'Brien County recordsIA records
Population estimate5629,215 (sum)3,210,984 (sum)
Population Density9.0 /sq mi----
County population rank#7 of 8----
State population rank#644 of 969----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in IA

ZIP CodeCityDistancePopulation estimate
ZIP 51245Primghar7.3 mi1,377
ZIP 51238Hospers7.8 mi1,502
ZIP 51248Sanborn8.0 mi1,534
ZIP 51201Sheldon8.3 mi6,430
ZIP 51046Paullina10.1 mi1,326

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →