Big Horn Academy Historic District · Photo: 25or6to4 · CC BY-SA 4.0Living in Cowley, WY: what to set up and who to call
All of Cowley gets its mail under one ZIP code, 82420. Public schools here are run by Big Horn County School District 1.
I’m new in town
What to set up in Cowley, 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 Cowley.
Water comes from Town of Cowley water system
The Town of Cowley water system supplies almost all of Cowley. It draws ground water (EPA lists Deaver Municipal Water System as seller) and serves 800 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 2022–Dec 2024, was 3.0 ppb, below the 15 ppb action level that applied. The highest in five years was 11.0 ppb. That’s higher than 81% of similar systems’ latest results.
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. WY5600206.
1 home internet providers serve Cowley
100% of 315 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| TCT Internet | DSL, Fiber | 100% | 1,000/1,000 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Cowley’s trash rules yet
Pickup rules, the dump and recycling in Cowley.
Where your child goes to school
Public school districts and the school path by grade.
Cowley is in Big Horn County School District 1.
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.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jun 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Cowley is in ZIP code 82420
ZIP codes where Cowley residents live, with the share of the town in each.
| ZIP | Post office name | Share of Cowley | ZIP’s residents in Cowley |
|---|---|---|---|
| 82420 | Cowley, WY | 100% | 84% |
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 Cowley
Who supplies Cowley’s drinking water, and has it had violations?
The Town of Cowley water system (EPA ID WY5600206). 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 3.0 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
What internet providers serve Cowley?
TCT Internet (FCC, as of December 2025).
What ZIP codes are in Cowley?
82420. Census 2020 ZIP Code Tabulation Areas.
What school district is Cowley in?
Big Horn County School District 1.
How do I register to vote in Cowley?
Wyoming has no online registration; you can register in person up to and including Election Day or by mail (received 14 days before). Elections here are run by the Big Horn County Clerk. Check your registration at sos.wyo.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.
- 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 Nov 18, 2024 (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.