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The Charco handbook

Living in Charco, AZ: what to set up and who to call

Charco has no town government of its own, so Pima County runs its elections and most services, and its children attend Indian Oasis-Baboquivari Unified District. Power in Charco comes from Trico Electric Cooperative, a cooperative utility rather than a private company.

Which school will my kid attend?How do I register to vote?ZIP codes
Charco has no town government. It’s a census-designated place in Pima County, so the county and regional agencies provide most services. This page answers what we can; the same answers appear on Charco’s town page under “Getting set up”.

I’m new in town

What to set up in Charco, and who provides it. Tap an answer for the details and where they come from.

PowerTrico Electric Cooperativecooperative utility · 14.3¢/kWhMore →Internet1 providers100% of addresses get 100/20 MbpsMore →Trash & dumpNot on file yetWe don’t have Charco’s trash rules yetMore →SchoolIndian Oasis-Baboquivari Unified DistrictWhich school depends on grade and addressMore →Register to voteOnlineRules from vote.govMore →ZIP code85321Where people live, not P.O. boxesMore →
Home services

Power, water and internet

Who to call to start service at a new address in Charco.

Electricity

Power comes from Trico Electric Cooperative

Trico Electric Cooperative (Trico Electric Cooperative Inc), a cooperative utility, serves all of Charco. Its homes paid an average of 14.3¢ per kWh in 2025, about $131 a month (its average across Arizona).

Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.

Internet

1 home internet providers serve Charco

100% of 1 addresses can get 100/20 Mbps; 100% can get fiber.

ProviderTechnologyAddressesFastest (Mbps)
Tohono O'Odham Utility AuthorityFiber100%250/50

FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.

Trash & recycling

We don’t have Charco’s trash rules yet

Pickup rules, the dump and recycling in Charco.

Trash, recycling and bulk pickupNot on fileCharco has no town government of its own, so look for trash and recycling rules on the county’s site.
Schools

Where your child goes to school

Public school districts and the school path by grade.

Charco kids go to
PK–3Indian Oasis Primary Elementary Schoolin Sells
7–8Baboquivari Middle Schoolin Topawa
9–12Baboquivari High Schoolin Topawa

Charco is in Indian Oasis-Baboquivari Unified 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.

Government & voting

No town hall: the county runs things

Charco is unincorporated, so Pima County is the local government.

Local governmentPima CountyCharco is a census-designated place: no town hall of its ownCensus
Who runs elections herePima County RecorderElections here are run by Pima County (county election office). P.O. Box 3145, Tucson, AZ 85702 · (520) 724-4330FVAP, Sep 2025
Register to voteOnlineIn 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).vote.govCheck your registration and polling placemy.arizona.voteThe state’s voter lookup

Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.

ZIP codes & area codes

Charco is in ZIP code 85321

ZIP codes where Charco residents live, with the share of the town in each.

ZIPPost office nameShare of CharcoZIP’s residents in Charco
85321Ajo, AZ100%1%
Area code520Wikidata

Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.

Everyday places

Getting around, the ER and the library

One line each; the subject pages have the rest.

Nearest emergency roomSells Hospital38.4 miles awayGet a library cardPima County Public LibraryNearest branch: Salazar-Ajo Branch Library, 15 W Plaza St. #179 · (520) 387-6075

ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.

Questions about living in Charco

Who provides electricity in Charco?

Trico Electric Cooperative (Trico Electric Cooperative Inc), a cooperative utility. Its homes paid about 14.3¢ per kWh in 2025 (EIA).

What internet providers serve Charco?

Tohono O'Odham Utility Authority (FCC, as of December 2025).

What ZIP codes are in Charco?

85321. Census 2020 ZIP Code Tabulation Areas.

What school district is Charco in?

Indian Oasis-Baboquivari Unified District.

How do I register to vote in Charco?

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 Pima 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 National Broadband Map, as of December 2025.