De Kalb Missouri ZIP Codes
De Kalb holds a single ZIP code.
Every ZIP code in De Kalb
| ZIP code | County |
|---|---|
| 64440 | Buchanan 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 De Kalb codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for De Kalb. 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 De Kalb ZIP code begins 644. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 70 ZIP codes, so De Kalb accounts for 1% of it.
Every Missouri ZIP prefix and the region it covers →
Area codes covering De Kalb
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 De Kalb occupies.
De Kalb Missouri area codes in full →
Where De Kalb's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near De Kalb
| City | Distance | ZIP codes |
|---|---|---|
| Rushville Missouri ZIP codes | 5.3 mi | 1 ZIP code |
| Dearborn Missouri ZIP codes | 9.2 mi | 1 ZIP code |
| Agency Missouri ZIP codes | 10 mi | 1 ZIP code |
| Weston Missouri ZIP codes | 13 mi | 1 ZIP code |
| Camden Point Missouri ZIP codes | 13 mi | 1 ZIP code |
| Edgerton Missouri ZIP codes | 17 mi | 1 ZIP code |
| Gower Missouri ZIP codes | 18 mi | 1 ZIP code |
| Easton Missouri ZIP codes | 18 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.