Listing
Zip Codes by County
(HOWARD County, Maryland Zip Codes)
| Zip Code | City | County | State | Area Code | Time Zone | DST | Latitude | Longitude |
| 20588 | Columbia | HOWARD | MD | 301/304 | EST | Y | 0.000000 | 0.000000 |
| 20588 | Dept Hs | HOWARD | MD | 301/304 | EST | Y | 0.000000 | 0.000000 |
| 20588 | DHS | HOWARD | MD | 301/304 | EST | Y | 0.000000 | 0.000000 |
| 20588 | Cheltenham | HOWARD | MD | 301/304 | EST | Y | 0.000000 | 0.000000 |
| 20701 | Annapolis Junction | HOWARD | MD | 301/410/443 | EST | Y | 39.129228 | -76.789212 |
| 20701 | Annapolis Jct | HOWARD | MD | 301/410/443 | EST | Y | 39.129228 | -76.789212 |
| 20723 | Laurel | HOWARD | MD | 240/301/410/443 | EST | Y | 39.140286 | -76.867378 |
| 20723 | Scaggsville | HOWARD | MD | 240/301/410/443 | EST | Y | 39.140286 | -76.867378 |
| 20759 | Fulton | HOWARD | MD | 301/410 | EST | Y | 39.162302 | -76.927766 |
| 20763 | Savage | HOWARD | MD | 240/301/410/443 | EST | Y | 39.134760 | -76.816239 |
| 20777 | Highland | HOWARD | MD | 301/410 | EST | Y | 39.176254 | -76.973010 |
| 20794 | Jessup | HOWARD | MD | 240/301/410/443 | EST | Y | 39.143627 | -76.789329 |
| 21029 | Clarksville | HOWARD | MD | 301/410/443 | EST | Y | 39.203744 | -76.951126 |
| 21036 | Dayton | HOWARD | MD | 301/410/443 | EST | Y | 39.235848 | -77.008132 |
| 21041 | Ellicott City | HOWARD | MD | 410 | EST | Y | 39.267300 | -76.798600 |
| 21041 | Ellicott | HOWARD | MD | 410 | EST | Y | 39.267300 | -76.798600 |
| 21042 | Ellicott | HOWARD | MD | 301/410/443 | EST | Y | 39.276698 | -76.899406 |
| 21042 | Ellicott City | HOWARD | MD | 301/410/443 | EST | Y | 39.276698 | -76.899406 |
| 21043 | Oella | HOWARD | MD | 202/301/410/443 | EST | Y | 39.256902 | -76.791739 |
| 21043 | Daniels | HOWARD | MD | 202/301/410/443 | EST | Y | 39.256902 | -76.791739 |
| 21043 | Ilchester | HOWARD | MD | 202/301/410/443 | EST | Y | 39.256902 | -76.791739 |
| 21043 | Ellicott | HOWARD | MD | 202/301/410/443 | EST | Y | 39.256902 | -76.791739 |
| 21043 | Ellicott City | HOWARD | MD | 202/301/410/443 | EST | Y | 39.256902 | -76.791739 |
| 21044 | Columbia | HOWARD | MD | 301/410/443 | EST | Y | 39.204420 | -76.881353 |
| 21045 | Columbia | HOWARD | MD | 240/301/410/443 | EST | Y | 39.207766 | -76.826430 |
| 21046 | Columbia | HOWARD | MD | 240/301/410/443 | EST | Y | 39.175036 | -76.837241 |
| 21075 | Hanover | HOWARD | MD | 240/301/410/443 | EST | Y | 39.200371 | -76.747374 |
| 21075 | Elkridge | HOWARD | MD | 240/301/410/443 | EST | Y | 39.200371 | -76.747374 |
| 21150 | Simpsonville | HOWARD | MD | 410 | EST | Y | 39.185700 | -76.877600 |
| 21163 | Granite | HOWARD | MD | 410 | EST | Y | 39.339327 | -76.857970 |
| 21163 | Henryton | HOWARD | MD | 410 | EST | Y | 39.339327 | -76.857970 |
| 21163 | Woodstock | HOWARD | MD | 410 | EST | Y | 39.339327 | -76.857970 |
| 21723 | Cooksville | HOWARD | MD | 410 | EST | Y | 39.328708 | -77.018090 |
| 21737 | Glenelg | HOWARD | MD | 301/410 | EST | Y | 39.260707 | -77.017558 |
| 21738 | Glenwood | HOWARD | MD | 301/410/443 | EST | Y | 39.281834 | -77.026329 |
| 21765 | Lisbon | HOWARD | MD | 410 | EST | Y | 39.312972 | -77.001713 |
| 21794 | W Friendship | HOWARD | MD | 301/410/443 | EST | Y | 39.292634 | -76.973283 |
| 21794 | West Friendship | HOWARD | MD | 301/410/443 | EST | Y | 39.292634 | -76.973283 |
| 21797 | Woodbine | HOWARD | MD | 301/410 | EST | Y | 39.352614 | -77.077784 |
