County ZIP codes · Ohio · FIPS 39147
Seneca County, OH ZIP Codes
Seneca County, Ohio has 21 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 20 residential and 1 for PO boxes or a single organization. 14 of the residential ones lie mainly in Seneca County and 6 mainly in a neighboring county; 13 cross the county line. Median household income ranges from $52,500 in 43410 (Clyde) to $90,281 in 44853 (New Riegel) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Seneca County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $62,692 and $73,529.
They carry 20 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 20 residential ZIP codes in Seneca County
14 ZIP codes lie mainly in Seneca County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 44883 | Tiffin | 28,102 | 170 | $63k | $164k | 100% |
| 44830 | Fostoria | 18,671 | 158 | $63k | $122k | 59% |
| 44836 | Green Springs | 2,496 | 70 | $79k | $140k | 82% |
| 44867 | Republic | 2,345 | 38 | $73k | $167k | 100% |
| 44807 | Attica | 2,244 | 32 | $87k | $153k | 80% |
| 44818 | Bloomville | 1,989 | 26 | $64k | $141k | 50% |
| 44853 | New Riegel | 1,391 | 51 | $90k | $156k | 100% |
| 44802 | Alvada | 746 | 27 | $80k | $197k | 51% |
| 44844 | McCutchenville | 744 | 40 | $84k | $160k | 52% |
| 44815 | Bettsville | 710 | 624 | $75k | $113k | 100% |
| 44841 | Kansas | 498 | 25 | $53k | – | 55% |
| 44828 | Flat Rock | 138 | 817 | – | – | 100% |
| 44809 | Bascom | 103 | 209 | – | $141k | 100% |
| 44861 | Old Fort | 31 | 146 | – | – | 100% |
Partly in Seneca County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 44811 | Bellevue | 12,690 | 107 | $70k | $172k | 33% |
| 43316 | Carey | 5,968 | 79 | $79k | $167k | 17% |
| 44882 | Sycamore | 2,133 | 30 | $74k | $164k | 9% |
| 43410 | Clyde | 10,220 | 199 | $53k | $165k | 9% |
| 44854 | New Washington | 1,630 | 40 | $70k | $146k | 7% |
| 43457 | Risingsun | 1,411 | 74 | $55k | $154k | 6% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
13 ZIP codes of Seneca County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Seneca | Elsewhere |
|---|---|---|
| 44830 | 59% | Hancock County 22%; Wood County 19% |
| 44811 | 33% | Huron County 33%; Sandusky County 19%; Erie County 14% |
| 43410 | 9% | Sandusky County 91% |
| 43316 | 17% | Wyandot County 79%; Hancock County 4% |
| 44836 | 82% | Sandusky County 18% |
| 44807 | 80% | Huron County 20% |
| 44882 | 9% | Wyandot County 58%; Crawford County 33% |
| 44818 | 50% | Crawford County 50% |
| 44854 | 7% | Crawford County 93% |
| 43457 | 6% | Wood County 56%; Sandusky County 38% |
| 44802 | 51% | Hancock County 49% |
| 44844 | 52% | Wyandot County 48% |
| 44841 | 55% | Sandusky County 45% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 44845 | Melmore |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Seneca County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Seneca County's ZIP codes use 3 prefixes: 433, 434 and 448.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 433 | Columbus, OH (SCF 430) | 1 | 43 |
| 434 | Toledo, OH (SCF 434) | 2 | 45 |
| 448 | Cleveland, OH (SCF 440) | 18 | 63 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.