O'Brien County, Iowa Zip Codes

Zip Code	City	Population
51346	Hartley	2,201
51248	Sanborn	1,712
51046	Paullina	1,432
51245	Primghar	1,096
51022	Granville	993
51058	Sutherland	982
51231	Archer	621
51009	Calumet	166

Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.