20 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 21043 | Ellicott City | 48,525 |
| 21044 | Columbia | 44,114 |
| 21042 | Ellicott City | 43,327 |
| 21045 | Columbia | 40,034 |
| 21075 | Elkridge | 37,363 |
| 20723 | Laurel | 36,866 |
| 20794 | Jessup | 16,814 |
| 21046 | Columbia | 15,608 |
| 21029 | Clarksville | 13,607 |
| 21797 | Woodbine | 8,643 |
| 20759 | Fulton | 6,624 |
| 21104 | Marriottsville | 6,052 |
| 21738 | Glenwood | 3,696 |
| 20777 | Highland | 3,221 |
| 20763 | Savage | 2,601 |
| 21036 | Dayton | 2,569 |
| 21737 | Glenelg | 2,474 |
| 21794 | West Friendship | 2,192 |
| 21723 | Cooksville | 669 |
| 20701 | Annapolis Junction | 513 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 20 ZCTAs in Howard County, Maryland (US Census).