Howard County Maryland has a total of 29 ZIP Codes. The ZIP Codes in Howard County range from 20701 to 21797. There are 11 ZIP Codes in Howard County that extend into adjacent counties (Anne Arundel County, Baltimore County, Carroll County, Frederick County, and Montgomery County).
| ZIP Code | ZIP Code City/Town | |||
|---|---|---|---|---|
| Annapolis Junction | |||
| Laurel | |||
| Fulton | |||
| Savage | |||
| Highland | |||
| Jessup | |||
| Brookeville | |||
| Clarksville | |||
| Dayton | |||
| Ellicott City | |||
| Ellicott City | |||
| Ellicott City | |||
| Columbia | |||
| Columbia | |||
| Columbia | |||
| Elkridge | |||
| Hanover | |||
| Marriottsville | |||
| Simpsonville | |||
| Woodstock | |||
| Catonsville | |||
| Cooksville | |||
| Glenelg | |||
| Glenwood | |||
| Lisbon | |||
| Mount Airy | |||
| Sykesville | |||
| West Friendship | |||
| Woodbine |