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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/78115

78115

ZIP 78115 is Geronimo, Texas, in Guadalupe County; area code 830; Central time.

Type
No street area
Time zone
America/Chicago
County
Guadalupe
Coordinates
29.5451, -98.0408

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 78155, whose figures describe that area — not this ZIP code.

☼ Live from 78115 — Geronimo, TX

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Where 78115 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 78115
  • 🔢 Type 78115 into a pocket calculator and turn it upside down: SIIBL — not quite a word, sorry.
  • ➕ As a number, 78,115 = 5 × 17 × 919. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011000100100011
  • 🏠 Its numerical neighbours: 78114 (Floresville, TX, 30 mi away) and 78116 (Gillett, TX, 35 mi away).
  • 🔄 Backwards, 78115 becomes 51187, which is not a ZIP code at all.
  • 👥 19 other ZIP codes are made of exactly the same digits (11758, 15781, 17518, 17581, 17815, 17851, …). The farthest-flung twin is 11758 in Massapequa, NY, 1,580 miles away.
  • 🧭 Farther south than 94% of all ZIP codes, and farther west than 77%.
  • 🎯711 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78115 and you would come out at 29.55°S, 81.96°E — 1,501 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 78115 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments6This ZIP6
Employees47This ZIP47
Annual payroll$1,097,000This ZIP$1,097,000

Land area

ZIP codes near 78115

ZIPCityDistance
78123 Mc Queeney, TX 4.1 mi
78156 Seguin, TX 6.2 mi
78155 Seguin, TX 6.3 mi
78124 Marion, TX 6.4 mi
78130 New Braunfels, TX 10.4 mi
78108 Cibolo, TX 10.8 mi
78131 New Braunfels, TX 12.0 mi
78135 New Braunfels, TX 12.0 mi
78152 Saint Hedwig, TX 12.7 mi
78154 Schertz, TX 13.3 mi

Find every ZIP code within 10 miles of 78115 →

Questions about this ZIP code

Where is ZIP code 78115?

78115 is in Geronimo, Texas, in Guadalupe County, part of the San Antonio-New Braunfels, TX metropolitan area. Its published point location is 29.5451, -98.0408.

What county is 78115 in?

78115 lies in Guadalupe County.

What area code is 78115?

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

What time zone is 78115 in?

78115 uses America/Chicago.

What ZIP codes are near 78115?

The closest are 78123 (4.1 mi), 78156 (6.2 mi), 78155 (6.3 mi), 78124 (6.4 mi) and 78130 (10.4 mi).

Is 78115 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. “78115 ZIP Code — Geronimo, Texas (Guadalupe County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78115

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