North Sioux City South Dakota ZIP Codes

North Sioux City holds a single ZIP code.

Every ZIP code in North Sioux City

The complete list of North Sioux City, South Dakota ZIP codes with the county each falls in.
ZIP code	County
57049	Union County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the North Sioux City codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for North Sioux City. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every North Sioux City ZIP code begins 570. Those first three digits identify the sectional center facility that processes mail for this part of South Dakota. Statewide that range covers 69 ZIP codes, so North Sioux City accounts for 1% of it.

Every South Dakota ZIP prefix and the region it covers →

Area codes covering North Sioux City

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground North Sioux City occupies.

605 Area code 605

North Sioux City South Dakota area codes in full →

Where North Sioux City's ZIP codes sit

Each point is one North Sioux City ZIP code, plotted from its record coordinates.

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

Cities near North Sioux City

The closest places to North Sioux City with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Jefferson South Dakota ZIP codes	6.0 mi	1 ZIP code
Elk Point South Dakota ZIP codes	14 mi	1 ZIP code
Vermillion South Dakota ZIP codes	28 mi	1 ZIP code
Alcester South Dakota ZIP codes	35 mi	1 ZIP code
Beresford South Dakota ZIP codes	40 mi	1 ZIP code
Hudson South Dakota ZIP codes	41 mi	1 ZIP code
Gayville South Dakota ZIP codes	42 mi	1 ZIP code
Wakonda South Dakota ZIP codes	45 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.