Howard County, Maryland ZIP Codes
- ZIP records
20 - Cities represented
17 - Sum of listed ZIP population estimates
335,512
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 21043 | Ellicott City | 48,525 |
| 2 | 21044 | Columbia | 44,114 |
| 3 | 21042 | Ellicott City | 43,327 |
| 4 | 21045 | Columbia | 40,034 |
| 5 | 21075 | Elkridge | 37,363 |
| 6 | 20723 | Laurel | 36,866 |
| 7 | 20794 | Jessup | 16,814 |
| 8 | 21046 | Columbia | 15,608 |
| 9 | 21029 | Clarksville | 13,607 |
| 10 | 21797 | Woodbine | 8,643 |
Cities in Howard County
- Annapolis Junction
- Clarksville
- Columbia
- Cooksville
- Dayton
- Elkridge
- Ellicott City
- Fulton
- Glenelg
- Glenwood
- Highland
- Jessup
- Laurel
- Marriottsville
- Savage
- West Friendship
- Woodbine
ZIP Directory
- ZIP 20701
- ZIP 20723
- ZIP 20759
- ZIP 20763
- ZIP 20777
- ZIP 20794
- ZIP 21029
- ZIP 21036
- ZIP 21042
- ZIP 21043
- ZIP 21044
- ZIP 21045
- ZIP 21046
- ZIP 21075
- ZIP 21104
- ZIP 21723
- ZIP 21737
- ZIP 21738
- ZIP 21794
- ZIP 21797
Browse all ZIP data for Maryland
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.