Photo: TCP04 · CC BY 4.0Living in St. Martins, MO: what to set up and who to call
Most mail in St. Martins goes to 65109 (95% of residents), one of 2 ZIP codes in town. The nearest library is Missouri River Regional Library, 9.1 miles away.
I’m new in town
What to set up in St. Martins, 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 St. Martins.
Power comes from Union Electric
Union Electric (Union Electric Co - (MO)), an investor-owned utility, serves all of St. Martins. Its homes paid an average of 13.3¢ per kWh in 2025, about $137 a month (its average across Missouri).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Cole County Pwsd 3
Cole County Pwsd 3 supplies St. Martins: about 93% of residents live in its service area. Cole County Pwsd 1 serves another 7%. It draws ground water and serves 2,000 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 1.9 ppb, below the 15 ppb action level that applied. The highest in five years was 3.1 ppb. That’s higher than 68% 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. Violations are counted by the start of their compliance period. MO3024162.
12 home internet providers serve St. Martins
100% of 497 addresses can get 100/20 Mbps; 91% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Co-Mo Connect | Fiber | 84% | 1,000/1,000 |
| Optimum | Cable | 71% | 500/20 |
| Socket Telecom | Fiber | 62% | 10,000/10,000 |
| Brightspeed | DSL | 41% | 40/3 |
| Mediacom Xtream | Cable | 2% | 1,000/50 |
| Wave Internet Technologies | Fixed wireless | 100% | 100/100 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have St. Martins’ trash rules yet
Pickup rules, the dump and recycling in St. Martins.
Where your child goes to school
Public school districts and the school path by grade.
St. Martins is in Jefferson City Public Schools.
B−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 Aug 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
St. Martins spans 2 ZIP codes
ZIP codes where St. Martins residents live, with the share of the town in each.
| ZIP | Post office name | Share of St. Martins | ZIP’s residents in St. Martins |
|---|---|---|---|
| 65109 | Jefferson City, MO | 95% | 3% |
| 65023 | Centertown, MO | 5% | 3% |
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 St. Martins
Who supplies St. Martins’ drinking water, and has it had violations?
Cole County Pwsd 3 (EPA ID MO3024162). 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 1.9 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in St. Martins?
Union Electric (Union Electric Co - (MO)), an investor-owned utility. Its homes paid about 13.3¢ per kWh in 2025 (EIA).
What internet providers serve St. Martins?
Co-Mo Connect, Optimum, Socket Telecom, Brightspeed, Mediacom Xtream, Wave Internet Technologies (FCC, as of December 2025).
What ZIP codes are in St. Martins?
65109 (95%), 65023 (5%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is St. Martins in?
Jefferson City Public Schools.
How do I register to vote in St. Martins?
In Missouri you can register online until 27 days before Election Day, in person until 27 days before Election Day, or by mail (postmarked 27 days before). Elections here are run by the Cole. Check your registration at voteroutreach.sos.mo.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.