Photo: Andrew Bossi · CC BY-SA 2.5Living in Four Corners, MD: what to set up and who to call
Four Corners has no town government of its own, so Montgomery County runs its elections and most services, and its children attend Montgomery County Public Schools. Adventist Healthcare White Oak Medical Center, 3.4 miles away, is the nearest emergency room.
I’m new in town
What to set up in Four Corners, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Four Corners.
Power comes from Potomac Electric Power
Potomac Electric Power (Potomac Electric Power Co), an investor-owned utility, serves all of Four Corners. Its homes paid an average of 21.7¢ per kWh in 2025, about $182 a month (its average across Maryland, for customers on its standard service). Maryland lets you buy power from another supplier; 5% of Potomac Electric Power’s home customers do, and Potomac Electric Power still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from WSSC Water
WSSC Water supplies almost all of Four Corners. It draws surface water and serves 1,900,000 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 82% of the 27 systems serving more than 1,000,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2018–Dec 2020, was 0.0 ppb, below the 15 ppb action level that applied. It’s from 2020: EPA has no newer result for this system. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. MD0150005.
5 home internet providers serve Four Corners
100% of 2,800 addresses can get 100/20 Mbps; 99% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Verizon | Fiber, Fixed wireless | 99% | 2,300/2,300 |
| Xfinity | Cable | 99% | 2,000/250 |
| Astound Broadband | Cable | 37% | 1,500/50 |
| AT&T | Fixed wireless | 52% | 100/20 |
| T-Mobile | Fixed wireless | 27% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Four Corners’ trash rules yet
Pickup rules, the dump and recycling in Four Corners.
Where your child goes to school
Public school districts and the school path by grade.
Four Corners is in Montgomery County Public Schools.
B+School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
No town hall: the county runs things
Four Corners is unincorporated, so Montgomery County is the local government.
Election office: FVAP local election office directory, updated Aug 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Mar 11, 2026.
Four Corners is in ZIP code 20901
ZIP codes where Four Corners residents live, with the share of the town in each.
| ZIP | Post office name | Share of Four Corners | ZIP’s residents in Four Corners |
|---|---|---|---|
| 20901 | Silver Spring, MD | 100% | 23% |
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Four Corners
Who supplies Four Corners’ drinking water, and has it had violations?
WSSC Water (EPA ID MD0150005). It reported no health-based violations to EPA in the five years to October 2026; 82% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2018–Dec 2020), against a 15 ppb action level.
Who provides electricity in Four Corners?
Potomac Electric Power (Potomac Electric Power Co), an investor-owned utility. Its homes paid about 21.7¢ per kWh in 2025 (EIA).
What internet providers serve Four Corners?
Verizon, Xfinity, Astound Broadband, AT&T, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Four Corners?
20901. Census 2020 ZIP Code Tabulation Areas.
What school district is Four Corners in?
Montgomery County Public Schools.
How do I register to vote in Four Corners?
In Maryland you can register online until 21 days before Election Day, in person up to and including Election Day, or by mail (postmarked 21 days before). Elections here are run by the Montgomery County Board of Elections. Check your registration at voterservices.elections.maryland.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Mar 11, 2026 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.