ZIP Code 77470

77470 is one of Texas's ZIP codes, delivering to addresses in Rock Island, Colorado County.

City: Rock Island
County: Colorado County
State: Texas
Prefix: 774xx

Where this code sits

77470 is part of the 774xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Rock Island.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 77470 delivers to without sharing its boundary.

979 Area code 979

ZIP codes nearest 77470

The ZIP codes whose reference points sit closest to 77470.
ZIP code	Distance	Delivers to
ZIP code 77442	6.3 mi	Garwood, TX
ZIP code 77475	6.3 mi	Sheridan, TX
ZIP code 77412	7.8 mi	Altair, TX
ZIP code 78943	12 mi	Glidden, TX
ZIP code 78934	12 mi	Columbus, TX
ZIP code 78935	13 mi	Alleyton, TX
ZIP code 77986	14 mi	Sublime, TX
ZIP code 77460	14 mi	Nada, 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 77470, plotted from its record coordinates.

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

Scope ZIP code 77470. 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.