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Zip Code 80109 — Castle Rock, CO

80109 is a ZIP Code associated with Castle Rock, CO, located within Douglas. The postal region supports an estimated population of 28,400 residents across Data Pending housing units, with a population density of 421.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.364730, -104.900560)

Data MetricLocal Statistic
Postal / Zip Code80109
Primary CityCastle Rock
State / ProvinceCO
CountyDouglas
Total Population28,400
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density421.9 people/sq mi
TimezoneAmerica/Denver

How 80109 Compares

MetricZIP 80109Douglas CountyCO State Average
Population28,400373,9965,862,421
Median IncomeData PendingN/AN/A
Population Density421.9 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 80108Castle Rock6.1 mi36,730N/A
Zip 80104Castle Rock6.1 mi38,479N/A
Zip 80131Louviers9.6 mi276N/A
Zip 80134Parker10.4 mi80,302N/A
Zip 80116Franktown10.5 mi5,132N/A

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 →