Plymouth County, Iowa Zip Codes

Zip Code	City	Population
51031	Le Mars	12,595
51108	Sioux City	5,555
51109	Sioux City	3,619
51050	Remsen	3,043
51001	Akron	2,370
51024	Hinton	2,125
51028	Kingsley	2,027
51038	Merrill	1,763
51062	Westfield	356
51008	Brunsville	168
51045	Oyens	113

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