This table ranks all 7 ZIP codes in the Washington, IN MSA by estimated 2022 population, from highest to lowest.
| # | ZIP Code | Place Name | Population (2022) |
|---|---|---|---|
| 1 | ZIP 47501 | Washington | 18,168 |
| 2 | ZIP 47553 | Loogootee | 8,734 |
| 3 | ZIP 47562 | Odon | 5,395 |
| 4 | ZIP 47558 | Montgomery | 4,604 |
| 5 | ZIP 47529 | Elnora | 1,194 |
| 6 | ZIP 47568 | Plainville | 671 |
| 7 | ZIP 47519 | Cannelburg | 621 |