Walnut Creek, California ZIP Codes
- ZIP records
4 - Sum of listed ZIP population estimates
90,740 - Counties represented
1 - Population range
16,988–27,206 per ZIP
Population sum includes positive estimates in these ZIP records; it is not an official city population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | County | Population estimate |
|---|---|---|---|---|
| 1 | 94598 | Walnut Creek | Contra Costa | 27,206 |
| 2 | 94596 | Walnut Creek | Contra Costa | 23,417 |
| 3 | 94597 | Walnut Creek | Contra Costa | 23,129 |
| 4 | 94595 | Walnut Creek | Contra Costa | 16,988 |
Counties represented
All ZIP Codes in Walnut Creek
- ZIP 94595 — Contra Costa County
- ZIP 94596 — Contra Costa County
- ZIP 94597 — Contra Costa County
- ZIP 94598 — Contra Costa County
Browse all ZIP data for California
Methodology: ZIP records are grouped by the source file's primary city and state fields. Population ranges and sums use positive ZIP-level estimates; sums should not be read as official city totals. County links use each record's listed county assignment.