ZIP Code 64440

64440 is one of Missouri's ZIP codes, delivering to addresses in De Kalb, Buchanan County.

City: De Kalb
County: Buchanan County
State: Missouri
Prefix: 644xx

Where this code sits

64440 is part of the 644xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to De Kalb.

De Kalb Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 64440 delivers to without sharing its boundary.

ZIP codes nearest 64440

The ZIP codes whose reference points sit closest to 64440.
ZIP code	Distance	Delivers to
ZIP code 64484	6.2 mi	Rushville, MO
ZIP code 64448	7.2 mi	Faucett, MO
ZIP code 64508	7.4 mi	Saint Joseph, MO
ZIP code 64504	9.1 mi	Saint Joseph, MO
ZIP code 64098	9.6 mi	Weston, MO
ZIP code 64439	9.7 mi	Dearborn, MO
ZIP code 66002	11 mi	Atchison, KS
ZIP code 64503	12 mi	Saint Joseph, MO

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 64440, plotted from its record coordinates.

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

Scope ZIP code 64440. 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.