Frederick, Maryland ZIP Codes
- ZIP records
5 - Sum of listed ZIP population estimates
154,625 - Counties represented
1 - Population range
6–49,605 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 | 21702 | Frederick | Frederick | 49,605 |
| 2 | 21701 | Frederick | Frederick | 43,048 |
| 3 | 21703 | Frederick | Frederick | 41,960 |
| 4 | 21704 | Frederick | Frederick | 20,006 |
| 5 | 21705 | Frederick | Frederick | 6 |
Counties represented
All ZIP Codes in Frederick
- ZIP 21701 — Frederick County
- ZIP 21702 — Frederick County
- ZIP 21703 — Frederick County
- ZIP 21704 — Frederick County
- ZIP 21705 — Frederick County
Browse all ZIP data for Maryland
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.