Irondale Missouri ZIP Codes
Irondale holds a single ZIP code.
Every ZIP code in Irondale
| ZIP code | County |
|---|---|
| 63648 | Washington 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Irondale codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Irondale. 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 Irondale ZIP code begins 636. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 37 ZIP codes, so Irondale accounts for 3% of it.
Every Missouri ZIP prefix and the region it covers →
Area codes covering Irondale
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 Irondale occupies.
Irondale Missouri area codes in full →
Where Irondale's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Irondale
| City | Distance | ZIP codes |
|---|---|---|
| Leadwood Missouri ZIP codes | 4.7 mi | 1 ZIP code |
| Bismarck Missouri ZIP codes | 5.5 mi | 1 ZIP code |
| Caledonia Missouri ZIP codes | 7.5 mi | 1 ZIP code |
| Mineral Point Missouri ZIP codes | 8.0 mi | 1 ZIP code |
| Potosi Missouri ZIP codes | 8.8 mi | 1 ZIP code |
| Bonne Terre Missouri ZIP codes | 9.0 mi | 1 ZIP code |
| Park Hills Missouri ZIP codes | 9.4 mi | 1 ZIP code |
| Farmington Missouri ZIP codes | 14 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.