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Zip Code 80104 — Castle Rock, CO

ZIP Code 80104 is associated with Castle Rock, CO, in Douglas County. The listed population estimate is 38,479; estimated density is 210.2 people per square mile. Among records with population estimates, it ranks #3 of 14 in Douglas County and #39 of 512 in CO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (39.302130, -104.819670)

Data MetricLocal Statistic
Postal / Zip Code80104
Primary CityCastle Rock
State / ProvinceCO
CountyDouglas
Total Population38,479
Population Density210.2 people/sq mi
TimezoneAmerica/Denver

How 80104 Compares

MetricZIP 80104Douglas County recordsCO records
Population estimate38,479373,996 (sum)5,862,421 (sum)
Population Density210.2 /sq mi----
County population rank#3 of 14----
State population rank#39 of 512----

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 CO

ZIP CodeCityDistancePopulation estimate
ZIP 80116Franktown5.4 mi5,132
ZIP 80109Castle Rock6.1 mi28,400
ZIP 80118Larkspur8.4 mi5,632
ZIP 80108Castle Rock10.0 mi36,730
ZIP 80134Parker12.7 mi80,302

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 →