ZIP CodesZIP codes in Howard County, Maryland
Howard County, Maryland has 22 ZIP codes in this list, from 20588 to 21794. They cover 18 places, among them Ellicott City, Columbia, Dhs and Annapolis Junction.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 20588 | Dhs | no area | 38.750, -76.854 |
| 20701 | Annapolis Junction | 2.2 | 39.133, -76.799 |
| 20723 | Laurel | 13.0 | 39.121, -76.844 |
| 20759 | Fulton | 6.3 | 39.150, -76.930 |
| 20763 | Savage | 1.1 | 39.138, -76.822 |
| 20777 | Highland | 7.5 | 39.184, -76.969 |
| 20794 | Jessup | 9.6 | 39.148, -76.792 |
| 21029 | Clarksville | 16.9 | 39.212, -76.951 |
| 21036 | Dayton | 6.3 | 39.234, -76.997 |
| 21041 | Ellicott City | no area | 39.236, -76.942 |
| 21042 | Ellicott City | 37.0 | 39.273, -76.861 |
| 21043 | Ellicott City | 17.1 | 39.255, -76.800 |
| 21044 | Columbia | 11.9 | 39.214, -76.879 |
| 21045 | Columbia | 9.7 | 39.205, -76.832 |
| 21046 | Columbia | 7.8 | 39.170, -76.854 |
| 21075 | Elkridge | 13.9 | 39.206, -76.753 |
| 21150 | Simpsonville | no area | 39.236, -76.942 |
| 21723 | Cooksville | 3.6 | 39.321, -77.005 |
| 21737 | Glenelg | 5.1 | 39.255, -77.020 |
| 21738 | Glenwood | 7.0 | 39.279, -77.015 |
| 21765 | Lisbon | no area | 39.338, -77.072 |
| 21794 | West Friendship | 8.2 | 39.293, -76.966 |
The ZIP code areas of Howard County add up to about 184 square miles of land (477 sq km) as the Census Bureau draws them. The largest is 21042 (Ellicott City), with 37.0 square miles.
Places with more than one code here: Ellicott City (3 codes), Columbia (3 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Dhs, MD 20588.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.