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Zip Code 91384 — Castaic, CA

ZIP Code 91384 is associated with Castaic, CA, in Los Angeles County. The listed population estimate is 26,478; estimated density is 98.7 people per square mile. Among records with population estimates, it ranks #184 of 288 in Los Angeles County and #692 of 1,762 in CA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (34.516040, -118.672890)

Data MetricLocal Statistic
Postal / Zip Code91384
Primary CityCastaic
State / ProvinceCA
CountyLos Angeles
Total Population26,478
Population Density98.7 people/sq mi
TimezoneAmerica/Los_Angeles

How 91384 Compares

MetricZIP 91384Los Angeles County recordsCA records
Population estimate26,4789,807,501 (sum)39,286,245 (sum)
Population Density98.7 /sq mi----
County population rank#184 of 288----
State population rank#692 of 1,762----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CA

ZIP CodeCityDistancePopulation estimate
ZIP 91354Valencia7.8 mi33,957
ZIP 91355Valencia8.1 mi29,123
ZIP 91381Stevenson Ranch10.4 mi22,582
ZIP 91350Santa Clarita11.4 mi43,973
ZIP 91351Canyon Country13.3 mi33,155

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →