Rockville, Maryland ZIP Codes
- ZIP records
4 - Sum of listed ZIP population estimates
145,330 - Counties represented
1 - Population range
14,946–50,353 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 | 20850 | Rockville | Montgomery | 50,353 |
| 2 | 20852 | Rockville | Montgomery | 48,180 |
| 3 | 20853 | Rockville | Montgomery | 31,851 |
| 4 | 20851 | Rockville | Montgomery | 14,946 |
Counties represented
All ZIP Codes in Rockville
- ZIP 20850 — Montgomery County
- ZIP 20851 — Montgomery County
- ZIP 20852 — Montgomery County
- ZIP 20853 — Montgomery 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.