Photo: Daniel Case · CC BY-SA 3.0Living in North Castle, NY: what to set up and who to call
North Castle spans 4 ZIP codes; 10504 holds the most residents (66%). The nearest library is North Castle Public Library, 1.4 miles away.
I’m new in town
What to set up in North Castle, 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 North Castle.
Power comes from Con Edison
Con Edison (Consolidated Edison Co. of New York), an investor-owned utility, serves all of North Castle. Its homes paid an average of 36.7¢ per kWh in 2025, about $137 a month (its average across New York, for customers on its standard service). New York lets you buy power from another supplier; 10% of Con Edison’s home customers do, and Con Edison still delivers it.
Start or move service: coned.com · (800) 752-6633
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from North Castle Water District #1
North Castle Water District #1 supplies North Castle: about 16% of residents live in its service area. North Castle Water District #4 serves another 9%. North Castle Water District #2 serves another 7%. North Castle Water District #5 serves another 5%. About 63% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It buys treated surface water (EPA lists White Plains City as seller) and serves 2,500 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 0.0 ppb, below the 15 ppb action level that applied. The highest in five years was 1.5 ppb. 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 (EPA’s estimate). Violations are counted by the start of their compliance period. NY5903445.
3 home internet providers serve North Castle
99% of 4,103 addresses can get 100/20 Mbps; 93% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Verizon | Fiber, Fixed wireless | 97% | 2,300/2,300 |
| Optimum | Cable, Fiber | 94% | 8,000/8,000 |
| T-Mobile | Fixed wireless | 35% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in North Castle is any weekday, depending on your street
Pickup days, the drop-off and recycling in North Castle, from the town’s own site.
Your pickup week
- TrashEvery week, on your street’s day (any weekday)Look up your day on northcastleny.gov
- Bulky itemsCall to book
From northcastleny.gov, the town’s official site, checked Oct 21, 2026; pages dated 2026. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Most of North Castle (79%) is in Byram Hills Central School District; parts are in Bedford Central School District (12%) and Valhalla Union Free School District (5%) and Mount Pleasant Central School District (4%).
A+School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
North Castle spans 4 ZIP codes
ZIP codes where North Castle residents live, with the share of the town in each.
| ZIP | Post office name | Share of North Castle | ZIP’s residents in North Castle |
|---|---|---|---|
| 10504 | Armonk, NY | 66% | 99% |
| 10603 | White Plains, NY | 18% | 12% |
| 10506 | Bedford, NY | 15% | 31% |
| 10604 | West Harrison, NY | 2% | 2% |
A few homes fall in 10549.
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 North Castle
Who supplies North Castle’s drinking water, and has it had violations?
North Castle Water District #1 (EPA ID NY5903445). 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 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in North Castle?
Con Edison (Consolidated Edison Co. of New York), an investor-owned utility. Its homes paid about 36.7¢ per kWh in 2025 (EIA).
What internet providers serve North Castle?
Verizon, Optimum, T-Mobile (FCC, as of December 2025).
What ZIP codes are in North Castle?
10504 (66%), 10603 (18%), 10506 (15%), 10604 (2%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is North Castle in?
Byram Hills Central School District. Parts of the city are in Bedford Central School District and Valhalla Union Free School District and Mount Pleasant Central School District.
How do I register to vote in North Castle?
In New York you can register online until 10 days before Election Day, in person until 10 days before Election Day, or by mail (postmarked 15 days before and received 10 days before). Elections here are run by the Westchester County Board of Elections. Check your registration at voterlookup.elections.ny.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: North Castle’s own website (northcastleny.gov), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- 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 Aug 3, 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.