ZIP Code 57049

57049 is one of South Dakota's ZIP codes, delivering to addresses in North Sioux City, Union County.

City: North Sioux City
County: Union County
State: South Dakota
Prefix: 570xx

Where this code sits

57049 is part of the 570xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to North Sioux City.

North Sioux City South Dakota ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 57049 delivers to without sharing its boundary.

605 Area code 605

ZIP codes nearest 57049

The ZIP codes whose reference points sit closest to 57049.
ZIP code	Distance	Delivers to
ZIP code 51109	1.5 mi	Sioux City, IA
ZIP code 51103	4.2 mi	Sioux City, IA
ZIP code 51104	5.4 mi	Sioux City, IA
ZIP code 51101	5.7 mi	Sioux City, IA
ZIP code 68743	6.0 mi	Jackson, NE
ZIP code 68776	6.1 mi	South Sioux City, NE
ZIP code 57038	6.4 mi	Jefferson, SD
ZIP code 51105	6.5 mi	Sioux City, IA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 57049, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 57049. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.