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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/78243

78243

ZIP 78243 is in San Antonio, Texas, in Bexar County; area codes 210 and 726; Central time. San Antonio has 83 ZIP codes in all.

Type
Standard
Time zone
America/Chicago
County
Bexar
Population
232
Coordinates
29.3710, -98.5930
☼ Live from 78243 — San Antonio, TX

Weather right now

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Local time: —

Where 78243 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 78243
  • 🔢 Type 78243 into a pocket calculator and turn it upside down: EhZBL — not quite a word, sorry.
  • ➕ As a number, 78,243 = 3 × 11 × 2371. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011000110100011
  • 🏠 Its numerical neighbours: 78242 (San Antonio, TX, 2 mi away) and 78244 (San Antonio, TX, 16 mi away).
  • 🔄 Backwards, 78243 becomes 34287 — and that is a real ZIP code: North Port, FL, 1,007 miles away.
  • 👥 44 other ZIP codes are made of exactly the same digits (23487, 23847, 23874, 24378, 24738, 24873, …). The farthest-flung twin is 83724 in Boise, ID, 1,382 miles away.
  • 🧭 Farther south than 95% of all ZIP codes, and farther west than 78%.
  • 🎯723 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78243 and you would come out at 29.37°S, 81.41°E — 1,500 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 16m.
  • 📏 At 0.642 square miles of land, 78243 is bigger than 6% of ZIP codes — about 311 football fields.
🌙 The sky over 78243 today
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🌋 Shake report
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Source: USGS.

People and housing

Population232This ZIP232
Households0
Housing units0
Median age21.0This ZIP21.0Texas35.6US 38.9
Bachelor's degree or higher0.0%
Mean commute11.0 minThis ZIP11.0 min
Population density361.4 / sq miThis ZIP361.4 / sq mi

Business and tax activity

Business establishments13This ZIP13
Employees85This ZIP85
Annual payroll$9,321,000This ZIP$9,321,000

Land area

Land area0.64 sq miThis ZIP0.64 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 78243

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 78243

ZIPCityDistance
78226 San Antonio, TX 1.6 mi
78242 San Antonio, TX 1.7 mi
78236 Jbsa Lackland, TX 2.1 mi
78211 San Antonio, TX 2.4 mi
78227 San Antonio, TX 3.1 mi
78237 San Antonio, TX 3.8 mi
78225 San Antonio, TX 4.2 mi
78224 San Antonio, TX 5.1 mi
78207 San Antonio, TX 5.4 mi
78204 San Antonio, TX 5.8 mi

Find every ZIP code within 10 miles of 78243 →

Questions about this ZIP code

Where is ZIP code 78243?

78243 is in San Antonio, Texas, in Bexar County, part of the San Antonio-New Braunfels, TX metropolitan area. Its published point location is 29.3710, -98.5930.

What county is 78243 in?

78243 lies in Bexar County.

What area code is 78243?

San Antonio uses area codes 210 and 726, from NANPA's telephone records.

What time zone is 78243 in?

78243 uses America/Chicago.

How many people live in 78243?

About 232 people live in ZIP code 78243, at 361.4 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What ZIP codes are near 78243?

The closest are 78226 (1.6 mi), 78242 (1.7 mi), 78236 (2.1 mi), 78211 (2.4 mi) and 78227 (3.1 mi).

Is 78243 a PO Box ZIP code?

78243 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “78243 ZIP Code — San Antonio, Texas (Bexar County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78243

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