Electric companies in St. Mary's County, Maryland

St. Mary's County, MD on the map

Electric utilities in St. Mary's County, MD

Plans from retail suppliers are not in public data, so no plan prices are shown. The listed utilities deliver the power, and which one serves your street depends on the address.

Housing and heating in St. Mary's County, MD

St. Mary's County, MD: 13,943 of 46,078 homes were built before 1980 and 16,500 in 2000 or later. St. Mary's County, MD has 33,775 detached houses, 5,276 homes in 5+ unit buildings, 1,545 mobile homes, and 11,418 of 41,743 households rent.

ZIP codes in St. Mary's County, MD

• 20606
• 20609
• 20618
• 20619
• 20620
• 20621
• 20624
• 20626
• 20628
• 20630
• 20634
• 20636
• 20650
• 20653
• 20656
• 20659
• 20660
• 20667
• 20670
• 20674
• 20680
• 20684
• 20686
• 20687
• 20690
• 20692

Facts about St. Mary's County, MD

Residents of St. Mary's County, MD, ACS 2023

114,37211 of 23 Maryland counties

Households in St. Mary's County, MD

41,7432.74 people each

Owner-occupied homes in St. Mary's County, MD

72.6%30,325 owner and 11,418 renter households

Median household income in St. Mary's County, MD

$114,5808 of 23 Maryland counties

Housing units in St. Mary's County, MD

46,0784,335 vacant or seasonal, 9.4% of the units

Homes heated by electricity in St. Mary's County, MD

59.2%24,729 homes, 8 of 23 Maryland counties

Utilities listed for St. Mary's County, MD

11 with a home price: Southern Maryland Elec Coop Inc

ZIP areas touching St. Mary's County, MD

2620606 to 20692

Outage-linked storm events in St. Mary's County, MD

229NWS storm events, 2015 to 2025

Homes built before 1980 in St. Mary's County, MD

30.3%median year built 1992

Flood claims in St. Mary's County, MD

88NFIP 2015 to 2025, $1.2M paid

Home energy burden in St. Mary's County, MD

2.2%$1,979 a year on electricity (DOE LEAD)

Electricity price since 2015 in St. Mary's County, MD

St. Mary's County, MD has no price series of its own. St. Mary's County, MD: the Maryland average was 13.82 ¢/kWh in 2015. St. Mary's County, MD: 17.86 ¢ in 2024, 29% up. St. Mary's County, MD: against 30% up for the U.S. average.

St. Mary's County, MD: a 929 kWh month at the Maryland price. St. Mary's County, MD: $128 in 2015, $166 in 2024. St. Mary's County, MD: $1,991 a year, 1.7% of the $114,580 median income.

Cost of living with electricity in St. Mary's County, MD

St. Mary's County, MD: electricity $1,979 a year per home (DOE LEAD), all home energy $2,775, 2.2% of $126,223 income. 41,211 households in St. Mary's County, MD spend about $81.6 million a year on electricity and $114.4 million on all home energy. Lower-income homes in St. Mary's County, MD ($25,566 a year) spend 7.7% of income, 3.5 times the all-home figure.

Outage risk in St. Mary's County, MD

St. Mary's County, MD, NWS storm events 2015 to 2025: 229 in all, 200.2 per 100,000 residents of 114,372, rank 9 of 23 Maryland counties. Property damage in St. Mary's County, MD: $7.4M, with 1 direct injuries or deaths.

Flood claims and flood insurance in St. Mary's County, MD

St. Mary's County, MD: 88 NFIP flood claims in 2015 to 2025, $1.2M paid, median paid claim $14,577.

990 of 41,939 residential structures in St. Mary's County, MD carry an NFIP contract. 1,045 NFIP policies of any type were in force in St. Mary's County, MD on 8 Sep 2026. St. Mary's County, MD lists 65 repetitive-loss properties, 5 of them severe repetitive loss.

St. Mary's County, MD: claims history, not an outage count.

St. Mary's County, MD: OpenFEMA NFIP, claims as of 8 Sep 2026, insured share as of 3 Aug 2026; counts under 5 are hidden.

St. Mary's County, MD: flood claims by state, flood hub.

Climate and electric heating in St. Mary's County, MD

St. Mary's County, MD totals 4,053 heating degree days and 1,328 cooling degree days a year (1991-2020 normal).

For heating, St. Mary's County, MD is the 21st coldest of 23 counties in Maryland: 4,053 against a median of 4,349. For cooling, St. Mary's County, MD is the 4th hottest: 1,328 against a median of 1,230.

St. Mary's County, MD runs furnace and air conditioner, 2,725 degree days apart.

St. Mary's County, MD: 3,767 heating degree days in 2016-2025, 4,053 on the normal, 7% under.

St. Mary's County, MD: 59.2% of 41,743 homes heat with electricity; 40.8% use gas, oil, wood or something else.

St. Mary's County, MD: ACS B25040, 41,743 homes; NOAA nClimDiv, retrieved 7 Oct 2026.

Bill and heat pump calculator, St. Mary's County, MD

Compare St. Mary's County, MD with its neighbours

• Calvert County sits 20 miles north of St. Mary's County, MD, with 93,791 residents against 114,372 there, 192 storm events against 229, median home built 1990 against 1992, energy burden 2.0% against 2.2%, income $132,059 against $114,580.
• Dorchester County sits 30 miles northeast of St. Mary's County, MD, with 32,612 residents against 114,372 there, 89 storm events against 229, median home built 1973 against 1992, energy burden 3.4% against 2.2%, income $60,495 against $114,580.
• Charles County sits 31 miles northwest of St. Mary's County, MD, with 168,710 residents against 114,372 there, 252 storm events against 229, median home built 1990 against 1992, energy burden 2.2% against 2.2%, income $120,592 against $114,580.
• Talbot County sits 41 miles northeast of St. Mary's County, MD, with 37,707 residents against 114,372 there, 124 storm events against 229, median home built 1982 against 1992, energy burden 2.4% against 2.2%, income $84,378 against $114,580.
• Prince George's County sits 47 miles northwest of St. Mary's County, MD, with 955,584 residents against 114,372 there, 295 storm events against 229, median home built 1977 against 1992, energy burden 2.0% against 2.2%, income $100,708 against $114,580.