Living in Poston, AZ: what to set up and who to call
Poston has no town government of its own, so La Paz County runs its elections and most services, and its children attend Parker Unified School District. Power in Poston comes from McMullen Valley Water C&D Dist, a political subdivision utility rather than a private company.
I’m new in town
What to set up in Poston, 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 Poston.
Power comes from McMullen Valley Water C&D Dist
McMullen Valley Water C&D Dist (McMullen Valley Water C&D Dist), a political subdivision utility, serves all of Poston.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Which providers serve Poston
This card will list the home internet providers the FCC’s National Broadband Map shows in Poston, the share of addresses that can get 100/20 Mbps and the share with fiber, with the map’s “as of” date.
Source to come: FCC Broadband Data Collection.
We don’t have Poston’s trash rules yet
Pickup rules, the dump and recycling in Poston.
Where your child goes to school
Public school districts and the school path by grade.
Poston is in Parker Unified School District.
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
Poston is unincorporated, so La Paz County is the local government.
Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Poston is in ZIP code 85371
ZIP codes where Poston residents live, with the share of the town in each.
| ZIP | Post office name | Share of Poston | ZIP’s residents in Poston |
|---|---|---|---|
| 85371 | Poston, AZ | 100% | 69% |
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 Poston
Who provides electricity in Poston?
McMullen Valley Water C&D Dist (McMullen Valley Water C&D Dist), a political subdivision utility.
What ZIP codes are in Poston?
85371. Census 2020 ZIP Code Tabulation Areas.
What school district is Poston in?
Parker Unified School District.
How do I register to vote in Poston?
In Arizona you can register online until 29 days before Election Day, in person until 29 days before Election Day, or by mail (postmarked 29 days before). Elections here are run by the La Paz County Recorder. Check your registration at my.arizona.vote.
Sources & dates
Every answer above names its source. Here they are with their dates.
- 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 Sep 12, 2025 (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): pending.