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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/91737

91737

ZIP 91737 is in Rancho Cucamonga, California, in San Bernardino County; area codes 909 and 840; Pacific time. Rancho Cucamonga has 5 ZIP codes; the others are 91701, 91729, 91730 and 91739.

Type
Standard
Time zone
America/Los_Angeles
Population
22,958
Coordinates
34.1552, -117.5781
☼ Live from 91737 — Rancho Cucamonga, CA

Weather right now

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Local time: —

Where 91737 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 91737
  • 🔢 Type 91737 into a pocket calculator and turn it upside down: LELIG — not quite a word, sorry.
  • ➕ As a number, 91,737 = 3 × 3 × 10193. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011001011001
  • 🏠 Its numerical neighbours: 91735 (El Monte, CA, 26 mi away) and 91739 (Rancho Cucamonga, CA, 3 mi away).
  • 🔄 Backwards, 91737 becomes 73719 — and that is a real ZIP code: Amorita, OK, 1,101 miles away.
  • 👥 24 other ZIP codes are made of exactly the same digits (13797, 17739, 31779, 37179, 37719, 37917, …). The farthest-flung twin is 13797 in Lisle, NY, 2,299 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 90%.
  • 🎯1,117 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91737 and you would come out at 34.16°S, 62.42°E — 1,011 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 10.1 square miles of land, 91737 is bigger than 27% of ZIP codes — room for about 7.7 Central Parks.
🌙 The sky over 91737 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population22,958This ZIP22,958
Households7,995This ZIP7,995
Housing units8,340This ZIP8,340
Median age44.8This ZIP44.8California37.9US 38.9
Median household income$122,334This ZIP$122,334California$99,122US $80,734
Median home value$878,400This ZIP$878,400California$734,700US $332,700
Median gross rent$2,371This ZIP$2,371California$2,036US $1,413
Bachelor's degree or higher41.4%This ZIP41.4%
Mean commute31.6 minThis ZIP31.6 min
Population density2,275.3 / sq miThis ZIP2,275.3 / sq mi

Business and tax activity

Business establishments393This ZIP393
Employees3,913This ZIP3,913
Annual payroll$127,403,000This ZIP$127,403,000
Tax returns filed11,390This ZIP11,390
Total adjusted gross income$1,351,316,000This ZIP$1,351,316,000

Land area

Land area10.09 sq miThis ZIP10.09 sq mi
Water area0.00 sq mi

Other place names in 91737

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

ZIP codes near 91737

ZIPCityDistance
91701 Rancho Cucamonga, CA 1.7 mi
91729 Rancho Cucamonga, CA 3.5 mi
91739 Rancho Cucamonga, CA 3.5 mi
91730 Rancho Cucamonga, CA 3.8 mi
91784 Upland, CA 4.5 mi
91785 Upland, CA 5.4 mi
91764 Ontario, CA 5.8 mi
91786 Upland, CA 5.9 mi
91743 Guasti, CA 6.3 mi
92358 Lytle Creek, CA 6.3 mi

Find every ZIP code within 10 miles of 91737 →

Questions about this ZIP code

Where is ZIP code 91737?

91737 is in Rancho Cucamonga, California, in San Bernardino County, part of the Riverside-San Bernardino-Ontario, CA metropolitan area. Its published point location is 34.1552, -117.5781.

What county is 91737 in?

91737 lies in San Bernardino County.

What area code is 91737?

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

What time zone is 91737 in?

91737 uses America/Los_Angeles.

How many people live in 91737?

About 22,958 people live in ZIP code 91737, in 7,995 households, at 2,275.3 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 91737?

$122,334 a year, against $99,122 across California.

What ZIP codes are near 91737?

The closest are 91701 (1.7 mi), 91729 (3.5 mi), 91739 (3.5 mi), 91730 (3.8 mi) and 91784 (4.5 mi).

Is 91737 a PO Box ZIP code?

91737 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “91737 ZIP Code — Rancho Cucamonga, California (San Bernardino County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91737

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