Castro Valley, California ZIP Codes
- ZIP records
2 - Sum of listed ZIP population estimates
59,361 - Counties represented
1 - Population range
14,506–44,855 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 | 94546 | Castro Valley | Alameda | 44,855 |
| 2 | 94552 | Castro Valley | Alameda | 14,506 |
Counties represented
All ZIP Codes in Castro Valley
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.