ZIP Code 77456

77456 is one of Texas's ZIP codes, delivering to addresses in Markham, Matagorda County.

City: Markham
County: Matagorda County
State: Texas
Prefix: 774xx

Where this code sits

77456 is part of the 774xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Markham.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 77456 delivers to without sharing its boundary.

979 Area code 979

ZIP codes nearest 77456

The ZIP codes whose reference points sit closest to 77456.
ZIP code	Distance	Delivers to
ZIP code 77440	5.5 mi	Elmaton, TX
ZIP code 77404	7.7 mi	Bay City, TX
ZIP code 77458	8.2 mi	Midfield, TX
ZIP code 77419	9.8 mi	Blessing, TX
ZIP code 77432	9.9 mi	Danevang, TX
ZIP code 77414	12 mi	Bay City, TX
ZIP code 77482	13 mi	Van Vleck, TX
ZIP code 77483	15 mi	Wadsworth, TX

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 77456, plotted from its record coordinates.

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

Scope ZIP code 77456. 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.