ZIP Code 63544

63544 is one of Missouri's ZIP codes, delivering to addresses in Green Castle, Sullivan County.

City: Green Castle
County: Sullivan County
State: Missouri
Prefix: 635xx

Where this code sits

63544 is part of the 635xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Green Castle.

Green Castle Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63544 delivers to without sharing its boundary.

660 Area code 660

ZIP codes nearest 63544

The ZIP codes whose reference points sit closest to 63544.
ZIP code	Distance	Delivers to
ZIP code 63545	4.0 mi	Green City, MO
ZIP code 63559	8.5 mi	Novinger, MO
ZIP code 63560	13 mi	Pollock, MO
ZIP code 63567	14 mi	Worthington, MO
ZIP code 63556	15 mi	Milan, MO
ZIP code 63565	16 mi	Unionville, MO
ZIP code 63566	16 mi	Winigan, MO
ZIP code 63501	16 mi	Kirksville, 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 63544, plotted from its record coordinates.

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

Scope ZIP code 63544. 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.