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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/91784

91784

ZIP 91784 is in Upland, California, in San Bernardino County; area codes 909 and 840; Pacific time. Upland has 3 ZIP codes; the others are 91785 and 91786.

Type
Standard
Time zone
America/Los_Angeles
Population
26,886
Coordinates
34.1411, -117.6556
☼ Live from 91784 — Upland, CA

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Local time: —

Where 91784 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 91784
  • 🔢 Type 91784 into a pocket calculator and turn it upside down: hBLIG — not quite a word, sorry.
  • ➕ As a number, 91,784 = 2 × 2 × 2 × 7 × 11 × 149. Its digits add up to 29, a total 1,296 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011010001000
  • 🏠 Its numerical neighbours: 91780 (Temple City, CA, 23 mi away) and 91785 (Upland, CA, 2 mi away).
  • 🔄 Backwards, 91784 becomes 48719, which is not a ZIP code at all.
  • 👥 32 other ZIP codes are made of exactly the same digits (14879, 14897, 17948, 18947, 18974, 19478, …). The farthest-flung twin is 18974 in Warminster, PA, 2,358 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 90%.
  • 🎯1,121 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91784 and you would come out at 34.14°S, 62.34°E — 1,008 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 52m.
  • 📏 At 9.1 square miles of land, 91784 is bigger than 26% of ZIP codes — room for about 6.9 Central Parks.
🌙 The sky over 91784 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population26,886This ZIP26,886
Households8,993This ZIP8,993
Housing units9,303This ZIP9,303
Median age46.6This ZIP46.6California37.9US 38.9
Median household income$154,349This ZIP$154,349California$99,122US $80,734
Median home value$891,600This ZIP$891,600California$734,700US $332,700
Median gross rent$2,945This ZIP$2,945California$2,036US $1,413
Bachelor's degree or higher46.8%This ZIP46.8%
Mean commute31.5 minThis ZIP31.5 min
Population density2,941.6 / sq miThis ZIP2,941.6 / sq mi

Business and tax activity

Business establishments498This ZIP498
Employees3,894This ZIP3,894
Annual payroll$146,316,000This ZIP$146,316,000
Tax returns filed13,810This ZIP13,810
Total adjusted gross income$1,869,819,000This ZIP$1,869,819,000

Land area

Land area9.14 sq miThis ZIP9.14 sq mi
Water area0.20 sq miThis ZIP0.20 sq mi

Other place names in 91784

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

ZIP codes near 91784

ZIPCityDistance
91785 Upland, CA 1.9 mi
91786 Upland, CA 2.5 mi
91701 Rancho Cucamonga, CA 3.2 mi
91711 Claremont, CA 3.5 mi
91729 Rancho Cucamonga, CA 4.3 mi
91737 Rancho Cucamonga, CA 4.5 mi
91730 Rancho Cucamonga, CA 5.1 mi
91763 Montclair, CA 5.4 mi
91758 Ontario, CA 5.4 mi
91764 Ontario, CA 5.4 mi

Find every ZIP code within 10 miles of 91784 →

Questions about this ZIP code

Where is ZIP code 91784?

91784 is in Upland, California, in San Bernardino County, part of the Riverside-San Bernardino-Ontario, CA metropolitan area. Its published point location is 34.1411, -117.6556.

What county is 91784 in?

91784 lies in San Bernardino County.

What area code is 91784?

Upland uses area codes 909 and 840, from NANPA's telephone records.

What time zone is 91784 in?

91784 uses America/Los_Angeles.

How many people live in 91784?

About 26,886 people live in ZIP code 91784, in 8,993 households, at 2,941.6 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 91784?

$154,349 a year, against $99,122 across California.

What ZIP codes are near 91784?

The closest are 91785 (1.9 mi), 91786 (2.5 mi), 91701 (3.2 mi), 91711 (3.5 mi) and 91729 (4.3 mi).

Is 91784 a PO Box ZIP code?

91784 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91784 ZIP Code — Upland, California (San Bernardino County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91784

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