ZIP code 80104 covers Castle Rock, Colorado in Douglas County. This area is served by 40 utility providers across 4 categories. The average residential electricity rate here is 15.2¢/kWh. 76.5% of households use natural gas as their primary heating fuel.
Estimated monthly utility costs
$310/month
Cost estimates from U.S. Census ACS 5-year data · Shorter bar = lower cost
Electric
Natural Gas
Water
Internet
Nearby ZIP codes
Frequently asked questions
How do I set up utilities when moving to 80104?
Contact each provider separately before your move-in date. Start with electric (CORE Electric Cooperative) and gas (Black Hills Energy, (888) 890-5554) since those typically need a few business days to activate. Water and sewer are often handled with one call to your local utility. Set up internet last since it may require an installation visit.
How much do utilities cost per month in 80104?
Total estimated monthly costs are around $309, which is about $74 less than the national average. Electricity is the biggest expense at roughly $125/month. Natural gas runs about $125. Water and sewer combined are around $60. Costs vary by home size, usage, and season. Estimates from U.S. Census ACS data.
Is electricity expensive in 80104?
Electricity costs in Castle Rock, CO are close to the national average. Based on 2023 NREL residential electricity rate data.
What internet providers are available in 80104?
Castle Rock, CO has strong broadband coverage. Providers include AERUX BROADBAND (Fiber up to 10,000 Mbps), AT&T (Fixed Wireless up to 100 Mbps), CenturyLink (Fiber / DSL up to 1,000 Mbps), Kellin Communications (Fixed Wireless up to 1,000 Mbps), Quantum Fiber (Fiber up to 8,000 Mbps). Availability varies by street address. Based on FCC Broadband Data Collection filings.
What county is 80104 in?
ZIP code 80104 is in Douglas County, Colorado.
Disclaimer: Provider information is sourced from federal databases including HIFLD, EPA SDWIS, FCC Broadband Data, and EIA-861. Utility cost estimates are from the U.S. Census Bureau American Community Survey 5-Year Estimates. Electric rates are based on 2023 NREL data. Coverage areas are approximate and may not reflect recent changes. Please verify directly with your provider.
Data sources: U.S. Census Bureau, NREL, EIA-861, HIFLD, EPA, FCC. Last updated: April 2026.