Find the last 4 digits (ZIP+4) for an address in 51101

ZIP 51101, Sioux City, IA is filled in. Just type the street address.

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ZIP Code 51101 – Sioux City, IA

Sioux City, Iowa · Woodbury County · Central time

ZIP code51101
CitySioux City
StateIowa
CountyWoodbury County
Population1,031
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area1.2 sq mi
Center (lat, long)42.4937, -96.3942

Area codes in this area

712

These are the area codes that most often serve ZIP 51101 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

51105 Sioux City · 1.7 mi51104 Sioux City · 2.9 mi51103 Sioux City · 3.3 mi68776 South Sioux City · 3.5 mi51106 Sioux City · 4.6 mi51111 Sioux City · 5.2 mi51108 Sioux City · 5.4 mi57049 North Sioux City · 6.2 mi

About ZIP 51101

ZIP code 51101 is assigned to Sioux City, Iowa. It lies in Woodbury County. Its Census area covers about 1.2 square miles of land. The closest neighboring ZIP is 51105 (Sioux City), about 1.7 miles away.

Every address in 51101 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources