Washington County, Missouri ZIP Codes
- ZIP records
10 - Cities represented
10 - Sum of listed ZIP population estimates
21,955
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 63664 | Potosi | 9,693 |
| 2 | 63630 | Cadet | 4,006 |
| 3 | 63660 | Mineral Point | 2,784 |
| 4 | 63648 | Irondale | 1,858 |
| 5 | 63071 | Richwoods | 1,113 |
| 6 | 63622 | Belgrade | 764 |
| 7 | 63626 | Blackwell | 588 |
| 8 | 63030 | Fletcher | 557 |
| 9 | 63631 | Caledonia | 544 |
| 10 | 63674 | Tiff | 48 |
Cities in Washington County
ZIP Directory
Browse all ZIP data for Missouri
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.