County ZIP codes · Ohio · FIPS 39171
Williams County, OH ZIP Codes
Williams County, Ohio has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 10 of the residential ones lie mainly in Williams County and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $52,917 in 43554 (Pioneer) to $86,200 in 43518 (Edon) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Williams 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 $58,578 and $74,925.
They carry 12 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 12 residential ZIP codes in Williams County
10 ZIP codes lie mainly in Williams County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 43506 | Bryan | 14,734 | 142 | $60k | $162k | 82% |
| 43543 | Montpelier | 7,401 | 87 | $56k | $137k | 100% |
| 43517 | Edgerton | 3,442 | 54 | $59k | $137k | 59% |
| 43557 | Stryker | 3,284 | 79 | $85k | $159k | 92% |
| 43518 | Edon | 2,897 | 42 | $86k | $147k | 100% |
| 43570 | West Unity | 2,867 | 64 | $69k | $130k | 93% |
| 43554 | Pioneer | 2,037 | 59 | $53k | $161k | 100% |
| 43501 | Alvordton | 715 | 27 | $68k | $115k | 100% |
| 43531 | Kunkle | 212 | 1,233 | $36k | $47k | 100% |
| 43505 | Blakeslee | 71 | 807 | – | – | 100% |
Partly in Williams County
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?
6 ZIP codes of Williams County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Williams | Elsewhere |
|---|---|---|
| 43506 | 82% | Defiance County 18% |
| 43502 | 2% | Fulton County 77%; Henry County 20% |
| 43517 | 59% | Defiance County 41% |
| 43557 | 92% | Henry County 6%; Fulton County 2% |
| 43570 | 93% | Fulton County 7% |
| 43521 | 2% | Fulton County 98% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Williams County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Williams County starts with 435.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 435 | Toledo, OH (SCF 434) | 12 | 55 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.