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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/91730

91730

ZIP 91730 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, 91737 and 91739.

Type
Standard
Time zone
America/Los_Angeles
Population
71,613
Coordinates
34.1004, -117.5813
☼ Live from 91730 — Rancho Cucamonga, CA

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Where 91730 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 91730
  • 🔢 Type 91730 into a pocket calculator and turn it upside down: OELIG — not quite a word, sorry.
  • ➕ As a number, 91,730 = 2 × 5 × 9173. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011001010010
  • 🏠 Its numerical neighbours: 91729 (Rancho Cucamonga, CA, 1 mi away) and 91731 (El Monte, CA, 26 mi away).
  • 🔄 Backwards, 91730 becomes 03719, which is not a ZIP code at all.
  • 👥 59 other ZIP codes are made of exactly the same digits (01379, 01937, 07193, 07931, 09137, 09173, …). The farthest-flung twin is 09173 in APO AE, a military post office, 5,898 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 90%.
  • 🎯1,118 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91730 and you would come out at 34.10°S, 62.42°E — 1,007 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 53m.
  • 📏 At 13.7 square miles of land, 91730 is bigger than 31% of ZIP codes — room for about 10 Central Parks.
🌙 The sky over 91730 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population71,613This ZIP71,613
Households25,836This ZIP25,836
Housing units26,697This ZIP26,697
Median age36.3This ZIP36.3California37.9US 38.9
Median household income$92,237This ZIP$92,237California$99,122US $80,734
Median home value$616,300This ZIP$616,300California$734,700US $332,700
Median gross rent$2,299This ZIP$2,299California$2,036US $1,413
Bachelor's degree or higher32.6%This ZIP32.6%
Mean commute32.6 minThis ZIP32.6 min
Population density5,216.2 / sq miThis ZIP5,216.2 / sq mi

Business and tax activity

Business establishments3,311This ZIP3,311
Employees51,205This ZIP51,205
Annual payroll$3,231,630,000This ZIP$3,231,630,000
Tax returns filed32,520This ZIP32,520
Total adjusted gross income$2,328,955,000This ZIP$2,328,955,000

Land area

Land area13.73 sq miThis ZIP13.73 sq mi
Water area0.00 sq miThis ZIP0.00 sq mi

Other place names in 91730

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

ZIP codes near 91730

ZIPCityDistance
91729 Rancho Cucamonga, CA 0.8 mi
91764 Ontario, CA 2.3 mi
91743 Guasti, CA 2.5 mi
91701 Rancho Cucamonga, CA 2.8 mi
91737 Rancho Cucamonga, CA 3.8 mi
91785 Upland, CA 4.5 mi
91761 Ontario, CA 4.5 mi
91786 Upland, CA 4.6 mi
91758 Ontario, CA 4.7 mi
91784 Upland, CA 5.1 mi

Find every ZIP code within 10 miles of 91730 →

Questions about this ZIP code

Where is ZIP code 91730?

91730 is in Rancho Cucamonga, California, in San Bernardino County, part of the Riverside-San Bernardino-Ontario, CA metropolitan area. Its published point location is 34.1004, -117.5813.

What county is 91730 in?

91730 lies in San Bernardino County.

What area code is 91730?

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

What time zone is 91730 in?

91730 uses America/Los_Angeles.

How many people live in 91730?

About 71,613 people live in ZIP code 91730, in 25,836 households, at 5,216.2 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 91730?

$92,237 a year, against $99,122 across California.

What ZIP codes are near 91730?

The closest are 91729 (0.8 mi), 91764 (2.3 mi), 91743 (2.5 mi), 91701 (2.8 mi) and 91737 (3.8 mi).

Is 91730 a PO Box ZIP code?

91730 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91730 ZIP Code — Rancho Cucamonga, California (San Bernardino County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91730

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