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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/92078

92078

ZIP 92078 is in San Marcos, California, in San Diego County; area codes 760 and 442; Pacific time. San Marcos has 4 ZIP codes; the others are 92069, 92079 and 92096.

Type
Standard
Time zone
America/Los_Angeles
County
San Diego
Population
53,605
Coordinates
33.1171, -117.1808
☼ Live from 92078 — San Marcos, CA

Weather right now

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Local time: —

Where 92078 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 92078
  • 🔢 Type 92078 into a pocket calculator and turn it upside down: BLOZG — not quite a word, sorry.
  • ➕ As a number, 92,078 = 2 × 7 × 6577. Its digits add up to 26, a total 2,038 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011110101110
  • 🏠 Its numerical neighbours: 92075 (Solana Beach, CA, 9 mi away) and 92079 (San Marcos, CA, 2 mi away).
  • 🔄 Backwards, 92078 becomes 87029 — and that is a real ZIP code: Lindrith, NM, 619 miles away.
  • 👥 41 other ZIP codes are made of exactly the same digits (02879, 07829, 07928, 09728, 09827, 20879, …). The farthest-flung twin is 09827 in APO AE, a military post office, 6,879 miles away.
  • 🧭 Farther south than 84% of all ZIP codes, and farther west than 90%.
  • 🎯1,130 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 92078 and you would come out at 33.12°S, 62.82°E — 953 miles from Port Louis, Mauritius, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 20m of daylight. Shortest: 9h 58m.
  • 📏 At 16.7 square miles of land, 92078 is bigger than 34% of ZIP codes — room for about 13 Central Parks.
🌙 The sky over 92078 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population53,605This ZIP53,605
Households18,522This ZIP18,522
Housing units19,339This ZIP19,339
Median age38.8This ZIP38.8California37.9US 38.9
Median household income$120,268This ZIP$120,268California$99,122US $80,734
Median home value$942,300This ZIP$942,300California$734,700US $332,700
Median gross rent$2,567This ZIP$2,567California$2,036US $1,413
Bachelor's degree or higher49.2%This ZIP49.2%
Mean commute26.5 minThis ZIP26.5 min
Population density3,209.9 / sq miThis ZIP3,209.9 / sq mi

Business and tax activity

Business establishments1,458This ZIP1,458
Employees16,140This ZIP16,140
Annual payroll$918,391,000This ZIP$918,391,000
Tax returns filed22,800This ZIP22,800
Total adjusted gross income$2,870,861,000This ZIP$2,870,861,000

Land area

Land area16.70 sq miThis ZIP16.70 sq mi
Water area0.12 sq miThis ZIP0.12 sq mi

Other place names in 92078

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

ZIP codes near 92078

ZIPCityDistance
92096 San Marcos, CA 1.6 mi
92079 San Marcos, CA 2.0 mi
92029 Escondido, CA 3.9 mi
92009 Carlsbad, CA 4.0 mi
92069 San Marcos, CA 4.2 mi
92091 Rancho Santa Fe, CA 4.5 mi
92081 Vista, CA 4.8 mi
92030 Escondido, CA 5.5 mi
92033 Escondido, CA 5.5 mi
92046 Escondido, CA 5.5 mi

Find every ZIP code within 10 miles of 92078 →

Questions about this ZIP code

Where is ZIP code 92078?

92078 is in San Marcos, California, in San Diego County, part of the San Diego-Chula Vista-Carlsbad, CA metropolitan area. Its published point location is 33.1171, -117.1808.

What county is 92078 in?

92078 lies in San Diego County.

What area code is 92078?

San Marcos uses area codes 760 and 442, from NANPA's telephone records.

What time zone is 92078 in?

92078 uses America/Los_Angeles.

How many people live in 92078?

About 53,605 people live in ZIP code 92078, in 18,522 households, at 3,209.9 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 92078?

$120,268 a year, against $99,122 across California.

What ZIP codes are near 92078?

The closest are 92096 (1.6 mi), 92079 (2 mi), 92029 (3.9 mi), 92009 (4 mi) and 92069 (4.2 mi).

Is 92078 a PO Box ZIP code?

92078 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “92078 ZIP Code — San Marcos, California (San Diego County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/92078

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