Photo: Billwhittaker · CC BY-SA 3.0Living in Denison, IA: what to set up and who to call
Denison runs its own electric utility, City of Denison. For a library card, the closest branch is Norelius Community Library, 0.1 miles out.
I’m new in town
What to set up in Denison, 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 Denison.
Power comes from City of Denison
City of Denison (City of Denison - (IA)), a municipal utility, serves 97.1% of Denison residents.
Start or move service: dmuonline.com · (712) 263-4154
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Denison Water Supply
Denison Water Supply supplies Denison: about 95% of residents live in its service area. About 5% 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 9,381 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 1.2 ppb, below the 15 ppb action level that applied. The highest in five years was 2.3 ppb. That’s higher than 54% 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. IA2424027.
7 home internet providers serve Denison
100% of 2,718 addresses can get 100/20 Mbps; 67% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Mediacom Xtream | Cable, Fiber | 96% | 1,000/50 |
| BTC | Fiber | 69% | 2,000/2,000 |
| Frontier | DSL, Fiber | 45% | 10/1 |
| Nextlink | Fixed wireless | 69% | 1,000/1,000 |
| Verizon | Fixed wireless | 33% | 300/20 |
| T-Mobile | Fixed wireless | 30% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Denison’s trash rules yet
Pickup rules, the dump and recycling in Denison.
Where your child goes to school
Public school districts and the school path by grade.
Denison is in Denison Community School District.
C+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 Jun 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Denison is in ZIP code 51442
ZIP codes where Denison residents live, with the share of the town in each.
| ZIP | Post office name | Share of Denison | ZIP’s residents in Denison |
|---|---|---|---|
| 51442 | Denison, IA | 100% | 86% |
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 Denison
Who supplies Denison’s drinking water, and has it had violations?
Denison Water Supply (EPA ID IA2424027). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 1.2 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Denison?
City of Denison (City of Denison - (IA)), a municipal utility.
What internet providers serve Denison?
Mediacom Xtream, BTC, Frontier, Nextlink, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Denison?
51442. Census 2020 ZIP Code Tabulation Areas.
What school district is Denison in?
Denison Community School District.
How do I register to vote in Denison?
In Iowa you can register online until 15 days before Election Day, in person up to and including Election Day, or by mail (postmarked 15 days before). Elections here are run by the Crawford County Auditor. Check your registration at sos.iowa.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 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.