Find the last 4 digits (ZIP+4) for an address in 51109

ZIP 51109, Sioux City, IA is filled in. Just type the street address.

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ZIP Code 51109 – Sioux City, IA

Sioux City, Iowa · Plymouth County · Central time

ZIP code51109
CitySioux City
StateIowa
CountyPlymouth CountyWoodbury County
Population3,606
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area17.61 sq mi
Center (lat, long)42.6103, -96.4700

Area codes in this area

712

These are the area codes that most often serve ZIP 51109 (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

57038 Jefferson · 5.9 mi51104 Sioux City · 6.2 mi57049 North Sioux City · 6.3 mi51103 Sioux City · 6.3 mi51108 Sioux City · 6.7 mi51062 Westfield · 6.9 mi51105 Sioux City · 8.8 mi51101 Sioux City · 8.9 mi

About ZIP 51109

ZIP code 51109 is assigned to Sioux City, Iowa. It crosses 2 counties; most of its land is in Plymouth County. Its Census area covers about 17.61 square miles of land. The closest neighboring ZIP is 57038 (Jefferson), about 5.9 miles away.

Every address in 51109 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