County ZIP codes · Ohio · FIPS 39167
Washington County, OH ZIP Codes
Washington County, Ohio has 24 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 21 residential and 3 for PO boxes or a single organization. 15 of the residential ones lie mainly in Washington County and 6 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $56,574 in 45714 (Belpre) to $84,286 in 45768 (Newport) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Washington 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 $56,574 and $82,110.
They carry 21 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 21 residential ZIP codes in Washington County
15 ZIP codes lie mainly in Washington County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 45750 | Marietta | 26,420 | 247 | $60k | $186k | 100% |
| 45714 | Belpre | 9,503 | 266 | $57k | $166k | 100% |
| 45742 | Little Hocking | 3,752 | 141 | $78k | $185k | 97% |
| 45786 | Waterford | 3,187 | 50 | $71k | $219k | 96% |
| 45784 | Vincent | 3,002 | 80 | $83k | $230k | 100% |
| 45767 | New Matamoras | 2,428 | 22 | $43k | $122k | 68% |
| 45744 | Lowell | 2,179 | 39 | $69k | $202k | 95% |
| 45729 | Fleming | 2,121 | 81 | $82k | $249k | 100% |
| 45768 | Newport | 1,503 | 48 | $84k | $204k | 100% |
| 45724 | Cutler | 1,218 | 22 | $59k | $149k | 100% |
| 45788 | Whipple | 691 | 21 | $101k | $195k | 100% |
| 45773 | Reno | 600 | 49 | $70k | $206k | 100% |
| 45746 | Macksburg | 329 | 19 | $65k | $110k | 76% |
| 45789 | Wingett Run | 280 | 20 | $82k | – | 90% |
| 45721 | Coal Run | 15 | 484 | – | – | 100% |
Partly in Washington County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 45745 | Lower Salem | 1,049 | 14 | $44k | $106k | 32% |
| 45715 | Beverly | 2,006 | 48 | $47k | $176k | 26% |
| 43787 | Stockport | 2,524 | 33 | $46k | $153k | 16% |
| 45711 | Amesville | 1,244 | 25 | $80k | $220k | 7% |
| 45723 | Coolville | 3,682 | 56 | $57k | $169k | 5% |
| 45727 | Dexter City | 944 | 30 | $23k | $112k | 3% |
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?
12 ZIP codes of Washington County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Washington | Elsewhere |
|---|---|---|
| 45742 | 97% | Athens County 3% |
| 45723 | 5% | Athens County 78%; Meigs County 17% |
| 45786 | 96% | Morgan County 4% |
| 43787 | 16% | Morgan County 84% |
| 45767 | 68% | Monroe County 32% |
| 45744 | 95% | Noble County 5% |
| 45715 | 26% | Morgan County 59%; Noble County 14% |
| 45711 | 7% | Athens County 82%; Morgan County 11% |
| 45745 | 32% | Noble County 52%; Monroe County 17% |
| 45727 | 3% | Noble County 97% |
| 45746 | 76% | Noble County 24% |
| 45789 | 90% | Monroe County 10% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 45712 | Barlow |
| 45713 | Bartlett |
| 45787 | Watertown |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Washington County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Washington County's ZIP codes use 2 prefixes: 437 and 457.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.