ZIP code 15821 covers St. Marys, Pennsylvania in Elk County. This area is served by 13 utility providers across 4 categories. The average residential electricity rate here is 10.0¢/kWh. 9.1% of households use wood 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 15821?
Contact each provider separately before your move-in date. Start with electric (FirstEnergy Pennsylvania Electric Co) and gas (Columbia Gas Of Pennsylvania, (724) 416-6300) 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 15821?
Total estimated monthly costs are around $309, which is about $74 less than the national average. Electricity is the biggest expense at roughly $75/month. Natural gas runs about $175. 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 15821?
No — electricity in St. Marys, PA costs about 33% less than the national average. Compared to Pennsylvania overall, rates here are about 23% lower. Based on 2023 NREL residential electricity rate data.
What internet providers are available in 15821?
St. Marys, PA has broadband coverage. Providers include T-Mobile (Fixed Wireless up to 25 Mbps), Verizon (Fixed Wireless up to 50 Mbps). Availability varies by street address. Based on FCC Broadband Data Collection filings.
What county is 15821 in?
ZIP code 15821 is in Elk County, Pennsylvania.
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.