Mulberry Fields · Photo: E.H. Pickering · Public domainLiving in Callaway, MD: what to set up and who to call
Callaway has no town government of its own, so St. Mary's County runs its elections and most services, and its children attend St. Marys County Public Schools. Power in Callaway comes from Southern Maryland Elec Coop, a cooperative utility rather than a private company.
I’m new in town
What to set up in Callaway, 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 Callaway.
Power comes from Southern Maryland Elec Coop
Southern Maryland Elec Coop (Southern Maryland Elec Coop Inc), a cooperative utility, serves all of Callaway. Its homes paid an average of 16.4¢ per kWh in 2025, about $192 a month (its average across Maryland, for customers on its standard service). Maryland lets you buy power from another supplier; 0% of Southern Maryland Elec Coop’s home customers do, and Southern Maryland Elec Coop still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Hunting Quarters water system
The Hunting Quarters water system supplies Callaway: about 43% of residents live in its service area. About 57% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 715 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 5,327 systems serving 501–1,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2021–Dec 2023, was 0.0 ppb, below the 15 ppb action level that applied. 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. MD0180038.
4 home internet providers serve Callaway
93% of 644 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Breezeline | Cable | 94% | 1,000/50 |
| Verizon | Fixed wireless | 23% | 300/20 |
| AT&T | Fixed wireless | 9% | 25/3 |
| T-Mobile | Fixed wireless | 7% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Callaway’s trash rules yet
Pickup rules, the dump and recycling in Callaway.
Where your child goes to school
Public school districts and the school path by grade.
Callaway is in St. Marys County Public Schools.
Test scores and every school: see 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
Callaway is unincorporated, so St. Mary's 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.
Callaway spans 3 ZIP codes
ZIP codes where Callaway residents live, with the share of the town in each.
| ZIP | Post office name | Share of Callaway | ZIP’s residents in Callaway |
|---|---|---|---|
| 20620 | Callaway, MD | 87% | 97% |
| 20650 | Leonardtown, MD | 11% | 1% |
| 20634 | Great Mills, MD | 3% | 1% |
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 Callaway
Who supplies Callaway’s drinking water, and has it had violations?
The Hunting Quarters water system (EPA ID MD0180038). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Callaway?
Southern Maryland Elec Coop (Southern Maryland Elec Coop Inc), a cooperative utility. Its homes paid about 16.4¢ per kWh in 2025 (EIA).
What internet providers serve Callaway?
Breezeline, Verizon, AT&T, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Callaway?
20620 (87%), 20650 (11%), 20634 (3%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Callaway in?
St. Marys County Public Schools.
How do I register to vote in Callaway?
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 Saint Mary's 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.