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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/91739

91739

ZIP 91739 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 91737.

Type
Standard
Time zone
America/Los_Angeles
Population
41,673
Coordinates
34.1564, -117.5169
☼ Live from 91739 — Rancho Cucamonga, CA

Weather right now

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Local time: —

Where 91739 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 91739
  • 🔢 Type 91739 into a pocket calculator and turn it upside down: GELIG — not quite a word, sorry.
  • ➕ As a number, 91,739 = 199 × 461. Its digits add up to 29, a total 1,296 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011001011011
  • 🏠 Its numerical neighbours: 91737 (Rancho Cucamonga, CA, 3 mi away) and 91740 (Glendora, CA, 20 mi away).
  • 🔄 Backwards, 91739 becomes 93719, which is not a ZIP code at all.
  • 👥 16 other ZIP codes are made of exactly the same digits (19397, 19973, 31799, 31997, 37919, 39179, …). The farthest-flung twin is 99731 in Fort Greely, AK, 2,395 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 90%.
  • 🎯1,113 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91739 and you would come out at 34.16°S, 62.48°E — 1,013 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 28.4 square miles of land, 91739 is bigger than 44% of ZIP codes — room for about 22 Central Parks.
🌙 The sky over 91739 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population41,673This ZIP41,673
Households11,990This ZIP11,990
Housing units12,512This ZIP12,512
Median age37.6This ZIP37.6California37.9US 38.9
Median household income$143,265This ZIP$143,265California$99,122US $80,734
Median home value$895,000This ZIP$895,000California$734,700US $332,700
Median gross rent$2,535This ZIP$2,535California$2,036US $1,413
Bachelor's degree or higher44.5%This ZIP44.5%
Mean commute32.6 minThis ZIP32.6 min
Population density1,466.2 / sq miThis ZIP1,466.2 / sq mi

Business and tax activity

Business establishments961This ZIP961
Employees11,454This ZIP11,454
Annual payroll$446,939,000This ZIP$446,939,000
Tax returns filed17,510This ZIP17,510
Total adjusted gross income$2,104,281,000This ZIP$2,104,281,000

Land area

Land area28.42 sq miThis ZIP28.42 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 91739

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

ZIP codes near 91739

ZIPCityDistance
91737 Rancho Cucamonga, CA 3.5 mi
92336 Fontana, CA 3.5 mi
91701 Rancho Cucamonga, CA 4.9 mi
91730 Rancho Cucamonga, CA 5.3 mi
92331 Fontana, CA 5.5 mi
91729 Rancho Cucamonga, CA 5.6 mi
92335 Fontana, CA 5.6 mi
92334 Fontana, CA 6.5 mi
92377 Rialto, CA 6.5 mi
92358 Lytle Creek, CA 6.9 mi

Find every ZIP code within 10 miles of 91739 →

Questions about this ZIP code

Where is ZIP code 91739?

91739 is in Rancho Cucamonga, California, in San Bernardino County, part of the Riverside-San Bernardino-Ontario, CA metropolitan area. Its published point location is 34.1564, -117.5169.

What county is 91739 in?

91739 lies in San Bernardino County.

What area code is 91739?

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

What time zone is 91739 in?

91739 uses America/Los_Angeles.

How many people live in 91739?

About 41,673 people live in ZIP code 91739, in 11,990 households, at 1,466.2 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 91739?

$143,265 a year, against $99,122 across California.

What ZIP codes are near 91739?

The closest are 91737 (3.5 mi), 92336 (3.5 mi), 91701 (4.9 mi), 91730 (5.3 mi) and 92331 (5.5 mi).

Is 91739 a PO Box ZIP code?

91739 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91739 ZIP Code — Rancho Cucamonga, California (San Bernardino County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91739

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