Photo: Nyttend · Public domainLiving in Monmouth, IL: what to set up and who to call
The Monmouth water system reported one health-based violation to EPA in the last five years: radium (combined radium-226 and -228), beginning Oct 2024. Monmouth has its own library, Warren County Public Library District, at 62 Public Square.
I’m new in town
What to set up in Monmouth, 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 Monmouth.
Power comes from Ameren Illinois Company
Ameren Illinois Company (Ameren Illinois Company), an investor-owned utility, serves all of Monmouth. Its homes paid an average of 16.7¢ per kWh in 2025, about $148 a month (its average across Illinois, for customers on its standard service). Illinois lets you buy power from another supplier; 45% of Ameren Illinois Company’s home customers do, and Ameren Illinois Company still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Monmouth water system
The Monmouth water system supplies almost all of Monmouth. It draws ground water and serves 8,902 people in all.
1 health-based violation reported to EPA in the five years to October 2026: radium (combined radium-226 and -228), beginning Oct 2024. 80% of the 5,012 systems serving 3,301–10,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2026–Dec 2028, was 2.9 ppb, below the 15 ppb action level that applied. The highest in five years was 6.3 ppb. That’s higher than 80% 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. IL1870150.
6 home internet providers serve Monmouth
100% of 3,519 addresses can get 100/20 Mbps; 26% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable, Fiber | 99% | 1,200/35 |
| Frontier | DSL | 86% | 10/1 |
| MTC Communications | Fiber | 25% | 1,000/1,000 |
| Verizon | Fixed wireless | 63% | 300/20 |
| Nextlink | Fixed wireless | 48% | 500/100 |
| T-Mobile | Fixed wireless | 36% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Monmouth’s trash rules yet
Pickup rules, the dump and recycling in Monmouth.
Where your child goes to school
Public school districts and the school path by grade.
Most of Monmouth (71%) is in Monmouth-Roseville Community Unit School District 238; parts are in United Community School District 304 (29%).
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 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Monmouth is in ZIP code 61462
ZIP codes where Monmouth residents live, with the share of the town in each.
| ZIP | Post office name | Share of Monmouth | ZIP’s residents in Monmouth |
|---|---|---|---|
| 61462 | Monmouth, IL | 100% | 81% |
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 Monmouth
Who supplies Monmouth’s drinking water, and has it had violations?
The Monmouth water system (EPA ID IL1870150). It reported 1 health-based violation to EPA in the five years to October 2026: radium (combined radium-226 and -228). 80% of systems its size had none. Its latest lead 90th percentile was 2.9 ppb (Jan 2026–Dec 2028), against a 15 ppb action level.
Who provides electricity in Monmouth?
Ameren Illinois Company (Ameren Illinois Company), an investor-owned utility. Its homes paid about 16.7¢ per kWh in 2025 (EIA).
What internet providers serve Monmouth?
Xfinity, Frontier, MTC Communications, Verizon, Nextlink, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Monmouth?
61462. Census 2020 ZIP Code Tabulation Areas.
What school district is Monmouth in?
Monmouth-Roseville Community Unit School District 238. Parts of the city are in United Community School District 304.
How do I register to vote in Monmouth?
In Illinois you can register online until 16 days before Election Day, in person up to and including Election Day, or by mail (postmarked 28 days before). Elections here are run by the Warren County Clerk. Check your registration at ova.elections.il.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 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.