South Sioux City Nebraska ZIP Codes
South Sioux City holds a single ZIP code.
Every ZIP code in South Sioux City
| ZIP code | County |
|---|---|
| 68776 | Dakota 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 South Sioux City codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for South Sioux City. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every South Sioux City ZIP code begins 687. Those first three digits identify the sectional center facility that processes mail for this part of Nebraska. Statewide that range covers 75 ZIP codes, so South Sioux City accounts for 1% of it.
Every Nebraska ZIP prefix and the region it covers →
Area codes covering South Sioux City
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground South Sioux City occupies.
South Sioux City Nebraska area codes in full →
Where South Sioux City's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near South Sioux City
| City | Distance | ZIP codes |
|---|---|---|
| Dakota City Nebraska ZIP codes | 3.1 mi | 1 ZIP code |
| Jackson Nebraska ZIP codes | 8.1 mi | 1 ZIP code |
| Homer Nebraska ZIP codes | 10 mi | 1 ZIP code |
| Hubbard Nebraska ZIP codes | 11 mi | 1 ZIP code |
| Winnebago Nebraska ZIP codes | 16 mi | 1 ZIP code |
| Waterbury Nebraska ZIP codes | 16 mi | 1 ZIP code |
| Ponca Nebraska ZIP codes | 17 mi | 1 ZIP code |
| Emerson Nebraska ZIP codes | 20 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.