Ohio · 9 covered places · 9 ZIP codes
Plumbers in Knox County, OH
We cover 9 cities and towns in Knox County, Ohio, across 9 ZIP codes, including Mount Vernon, Fredericktown, Howard. About 64,000 people live in those ZIP codes. 39% of the homes were built before 1960, so galvanized pipe and old cast iron drains are common.
| Year built | Share of homes |
|---|---|
| Before 1940 | 25% |
| 1940–1959 | 14% |
| 1960–1979 | 20% |
| 1980–1999 | 23% |
| 2000 or later | 18% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Mount Vernon | 30,360 | 48% |
| Fredericktown | 9,517 | 41% |
| Howard | 8,063 | 11% |
| Centerburg | 6,978 | 26% |
| Danville | 4,185 | 41% |
| Gambier | 3,621 | 41% |
| Brinkhaven | 521 | 51% |
| Bladensburg | 308 | 100% |
| Martinsburg | 265 | 49% |
What goes wrong in Knox County homes
Pre-1960 homes: galvanized pipe and cast iron
39% of homes in Knox County's covered ZIP codes were built before 1960, 25% of them before 1940. Houses that old often still have galvanized steel supply lines that rust closed from the inside, and cast iron or clay sewer pipe that cracks and lets roots in. Weak pressure at upstairs fixtures, brown water after a shutoff and slow drains are the usual clues. Typical fixes are whole-house repiping and a sewer camera inspection.
Long, hard winters
60% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a long Ohio winter those are the lines that freeze and split. See frozen and burst pipe repair.
Natural gas in most homes
54% of occupied homes here heat with utility gas, so gas water heaters, ranges and dryers are common. That means gas line extensions for new appliances, flexible connector replacements and venting checks when a water heater is swapped. If you smell gas, leave first and call the gas utility from outside. See gas line repair.
Propane service
16% of homes here use bottled or tank propane for heat, typical of areas beyond the gas mains. Propane water heaters, ranges and generators need correctly sized lines and fittings rated for LP. See gas appliance hookups.
Common plumbing work in Knox County
Other covered towns in Knox County
- Bladensburg (1 ZIP)
- Brinkhaven (1 ZIP)
- Centerburg (1 ZIP)
- Danville (1 ZIP)
- Fredericktown (1 ZIP)
- Gambier (1 ZIP)
- Howard (1 ZIP)
- Martinsburg (1 ZIP)
- Mount Vernon (1 ZIP)
Knox County plumbing FAQ
Which towns in Knox County do you cover?
9 places: Bladensburg, Brinkhaven, Centerburg, Danville, Fredericktown, Gambier, Howard, Martinsburg, Mount Vernon. Enter your ZIP code to confirm coverage for your street.
How old are homes in Knox County?
Across the covered ZIP codes, Census estimates put 39% of homes as built before 1960, 20% from 1960 to 1979, 23% from 1980 to 1999 and 18% in 2000 or later.
Who licenses plumbers in Knox County, OH?
The Ohio Construction Industry Licensing Board (OCILB) licenses plumbing contractors; many cities also register them.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in Knox County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Knox County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.