Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/TX/ROUND-MOUNTAIN

Round Mountain ZIP code, Texas

The ZIP code for Round Mountain, TX is 78663, and its area code is 830.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
81
Area code
830
State
Texas

Mail addressed to Round Mountain uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

ZIP codes addressed as Round Mountain

ZIP codes with the USPS city name Round Mountain
ZIP City Type Population Median income Median home
78663 Round Mountain , TX Standard 503 $168,125 $356,800

Other ZIP codes overlapping Round Mountain

These ZIP codes cover part of Round Mountain but are addressed as somewhere else.

ZIP codes overlapping Round Mountain
ZIP City Type Population Median income Median home
78636 Johnson City , TX Standard 4,134 $72,663 $532,600

Map of Round Mountain ZIP codes

78663

The ZIP codes of Round Mountain, TX, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Round Mountain

The nearest larger towns are Johnson City (1,921 people, 8.9 mi), Horseshoe Bay (4,854 people, 10 mi) and Cottonwood Shores (1,859 people, 11 mi).

Towns near Round Mountain
TownPopulationDistance
Horseshoe Bay 4,854 10.2 mi
Marble Falls 7,752 12.5 mi
Granite Shoals 5,328 13.4 mi
Briarcliff 2,735 18.9 mi
Kingsland 7,330 19.6 mi
Dripping Springs 7,405 21.0 mi
Lago Vista 9,650 22.4 mi
Lakeway 19,307 22.5 mi
The Hills 2,516 22.6 mi
Bee Cave 8,862 24.5 mi
Burnet 6,732 25.7 mi
Hudson Bend 4,127 25.9 mi
Jonestown 2,535 26.3 mi
Belterra 6,978 26.6 mi

More nearby: every ZIP code in Blanco County · Texas ZIP codes

Cite this page

zipcodes.pro. “Round Mountain, TX ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/tx/round-mountain

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