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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 — ZIP/78604

78604

ZIP 78604 is Belmont, Texas, in Gonzales County; area code 830; Central time.

Type
No street area
Time zone
America/Chicago
County
Gonzales
Metro area
none
Coordinates
29.5233, -97.6839

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 78629, whose figures describe that area — not this ZIP code.

☼ Live from 78604 — Belmont, TX

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Where 78604 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 78604
  • 🔢 Type 78604 into a pocket calculator and turn it upside down: hOgBL — not quite a word, sorry.
  • ➕ As a number, 78,604 = 2 × 2 × 43 × 457. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001100001100
  • 🏠 Its numerical neighbours: 78602 (Bastrop, TX, 47 mi away) and 78605 (Bertram, TX, 89 mi away).
  • 🔄 Backwards, 78604 becomes 40687, which is not a ZIP code at all.
  • 👥 47 other ZIP codes are made of exactly the same digits (04768, 04786, 06478, 06487, 06784, 07648, …). The farthest-flung twin is 04786 in Washburn, ME, 1,978 miles away.
  • 🧭 Farther south than 94% of all ZIP codes, and farther west than 76%.
  • 🎯714 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78604 and you would come out at 29.52°S, 82.32°E — 1,510 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 02m of daylight. Shortest: 10h 15m.
🌙 The sky over 78604 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees19This ZIP19
Annual payroll$360,000This ZIP$360,000

Land area

ZIP codes near 78604

ZIPCityDistance
78122 Leesville, TX 4.8 mi
78658 Ottine, TX 6.2 mi
78614 Cost, TX 9.7 mi
78638 Kingsbury, TX 11.2 mi
78648 Luling, TX 12.1 mi
78677 Wrightsboro, TX 13.4 mi
78661 Prairie Lea, TX 14.4 mi
78629 Gonzales, TX 14.5 mi
78155 Seguin, TX 15.2 mi
78140 Nixon, TX 15.7 mi

Find every ZIP code within 10 miles of 78604 →

Questions about this ZIP code

Where is ZIP code 78604?

78604 is in Belmont, Texas, in Gonzales County. Its published point location is 29.5233, -97.6839.

What county is 78604 in?

78604 lies in Gonzales County.

What area code is 78604?

Belmont uses area code 830, from NANPA's telephone records.

What time zone is 78604 in?

78604 uses America/Chicago.

What ZIP codes are near 78604?

The closest are 78122 (4.8 mi), 78658 (6.2 mi), 78614 (9.7 mi), 78638 (11.2 mi) and 78648 (12.1 mi).

Is 78604 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “78604 ZIP Code — Belmont, Texas (Gonzales County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78604

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