Find the last 4 digits (ZIP+4) for an address in 51111

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ZIP Code 51111 – Sioux City, IA

Sioux City, Iowa · Woodbury County · Central time

ZIP code51111
CitySioux City
StateIowa
CountyWoodbury County
Population39
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area6.06 sq mi
Center (lat, long)42.4185, -96.3931

Area codes in this area

712

These are the area codes that most often serve ZIP 51111 (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

68776 South Sioux City · 3.8 mi51054 Sergeant Bluff · 3.9 mi68731 Dakota City · 5.1 mi51106 Sioux City · 5.1 mi51102 Sioux City · 5.2 mi51101 Sioux City · 5.2 mi51105 Sioux City · 6.3 mi51103 Sioux City · 7.5 mi

About ZIP 51111

ZIP code 51111 is assigned to Sioux City, Iowa. It lies in Woodbury County. Its Census area covers about 6.06 square miles of land. The closest neighboring ZIP is 68776 (South Sioux City), about 3.8 miles away.

Every address in 51111 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