This area is served by 25 utility providers across 4 categories. The average residential electricity rate here is 14.0¢/kWh. 3.8% of households use bottled/lp gas as their primary heating fuel.
Utility rates in ZIP 57730 vs. US average
Typical monthly utility bills in ZIP 57730
Figures from U.S. Census ACS 5-year estimates, reflecting households that pay utilities separately from rent. In dense urban areas where heat or hot water is often included in rent, these numbers represent the subset of residents who pay directly.
Electric
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Sewer
Internet
Nearby ZIP codes
Frequently asked questions
How do I set up utilities when moving to 57730?
Contact each provider separately before your move-in date. Start with electric (Black Hills Electric Coop, Inc) 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 do utility rates in 57730 compare to the national average?
Residential electricity in Custer, SD averages 14.0¢/kWh, about 15% below the US average of 16.5¢/kWh and 9% above the South Dakota state average of 12.9¢/kWh. Natural gas in South Dakota averages $9.32/Mcf, about 36% below the national average. Actual monthly bills vary by home size, insulation, and season. Local rates from NREL; state and US averages from EIA Form 861 (2024); natural gas prices from EIA Form 176 (2024).
Is electricity expensive in 57730?
No — electricity in Custer, SD costs about 15% less than the national average. Compared to South Dakota overall, rates here are about 9% higher. Local rates from NREL (2023); state and US averages from EIA (2024).
What internet providers are available in 57730?
Custer, SD has strong broadband coverage. Providers include AT&T (Fixed Wireless up to 100 Mbps), CenturyLink (DSL up to 40 Mbps), Golden West Telecommunications (Fiber / DSL up to 1,000 Mbps), Mt. Rushmore Telephone Company (Fiber / DSL up to 1,000 Mbps), T-Mobile (Fixed Wireless up to 100 Mbps). Availability varies by street address. Based on FCC Broadband Data Collection filings.
What county is 57730 in?
ZIP code 57730 is in Custer County, South Dakota.
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. Local electric rates are based on 2023 NREL Utility Rate Database data; state and US averages are from EIA Form 861 (2024). 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: May 2026.