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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/91384

91384

ZIP 91384 is in Castaic, California, in Los Angeles County; area code 661; Pacific time. Castaic has 2 ZIP codes; the other is 91310.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
26,478
Coordinates
34.5201, -118.6683
☼ Live from 91384 — Castaic, CA

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Where 91384 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 91384
  • 🔢 Type 91384 into a pocket calculator and turn it upside down: hBEIG — not quite a word, sorry.
  • ➕ As a number, 91,384 = 2 × 2 × 2 × 11423. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110010011111000
  • 🏠 Its numerical neighbours: 91383 (Santa Clarita, CA, 11 mi away) and 91385 (Valencia, CA, 6 mi away).
  • 🔄 Backwards, 91384 becomes 48319, which is not a ZIP code at all.
  • 👥 36 other ZIP codes are made of exactly the same digits (13489, 13849, 14839, 14893, 18349, 18439, …). The farthest-flung twin is 18943 in Penns Park, PA, 2,405 miles away.
  • 🧭 Farther south than 76% of all ZIP codes, and farther west than 92%.
  • 🎯1,162 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91384 and you would come out at 34.52°S, 61.33°E — 1,008 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 28m of daylight. Shortest: 9h 50m.
  • 📏 At 103.6 square miles of land, 91384 is bigger than 79% of ZIP codes — room for about 79 Central Parks.
🌙 The sky over 91384 today
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🌋 Shake report
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Source: USGS.

People and housing

Population26,478This ZIP26,478
Households7,124This ZIP7,124
Housing units7,270This ZIP7,270
Median age35.8This ZIP35.8California37.9US 38.9
Median household income$131,689This ZIP$131,689California$99,122US $80,734
Median home value$767,300This ZIP$767,300California$734,700US $332,700
Median gross rent$1,745This ZIP$1,745California$2,036US $1,413
Bachelor's degree or higher32.3%This ZIP32.3%
Mean commute31.3 minThis ZIP31.3 min
Population density255.6 / sq miThis ZIP255.6 / sq mi

Business and tax activity

Business establishments343This ZIP343
Employees2,170This ZIP2,170
Annual payroll$95,271,000This ZIP$95,271,000
Tax returns filed11,110This ZIP11,110
Total adjusted gross income$1,075,700,000This ZIP$1,075,700,000

Land area

Land area103.60 sq miThis ZIP103.60 sq mi
Water area0.79 sq miThis ZIP0.79 sq mi

Other place names in 91384

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

ZIP codes near 91384

ZIPCityDistance
91310 Castaic, CA 3.4 mi
91385 Valencia, CA 6.3 mi
91354 Valencia, CA 7.8 mi
91355 Valencia, CA 9.9 mi
91381 Stevenson Ranch, CA 10.7 mi
91390 Santa Clarita, CA 10.7 mi
91350 Santa Clarita, CA 11.3 mi
91380 Santa Clarita, CA 11.4 mi
91382 Santa Clarita, CA 11.4 mi
91383 Santa Clarita, CA 11.4 mi

Find every ZIP code within 10 miles of 91384 →

Questions about this ZIP code

Where is ZIP code 91384?

91384 is in Castaic, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.5201, -118.6683.

What county is 91384 in?

91384 lies in Los Angeles County.

What area code is 91384?

Castaic uses area code 661, from NANPA's telephone records.

What time zone is 91384 in?

91384 uses America/Los_Angeles.

How many people live in 91384?

About 26,478 people live in ZIP code 91384, in 7,124 households, at 255.6 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 91384?

$131,689 a year, against $99,122 across California.

What ZIP codes are near 91384?

The closest are 91310 (3.4 mi), 91385 (6.3 mi), 91354 (7.8 mi), 91355 (9.9 mi) and 91381 (10.7 mi).

Is 91384 a PO Box ZIP code?

91384 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91384 ZIP Code — Castaic, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91384

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