ZIP code ranking · MD
Most Populous ZIP Codes in MD
The top 25 ZIP codes ranked by population in MD. The ranking pulls from the latest available data; ZIPs with implausible or incomplete data are excluded.
| Rank | ZIP | Where | Population |
|---|---|---|---|
| 1 | 20906 | Aspen Hill CDP, MD· Montgomery County | 70,595 |
| 2 | 21234 | Carney CDP, MD· Baltimore County | 66,334 |
| 3 | 20878 | Gaithersburg, MD· Montgomery County | 66,115 |
| 4 | 21740 | Hagerstown, MD· Washington County | 64,792 |
| 5 | 21117 | Owings Mills CDP, MD· Baltimore County | 62,816 |
| 6 | 20874 | Darnestown CDP, MD· Montgomery County | 62,738 |
| 7 | 21122 | Lake Shore CDP, MD· Anne Arundel County | 61,566 |
| 8 | 21222 | Dundalk CDP, MD· Baltimore County | 59,407 |
| 9 | 20904 | Colesville CDP, MD· Montgomery County | 58,646 |
| 10 | 21061 | Glen Burnie CDP, MD· Anne Arundel County | 57,230 |
| 11 | 20744 | Fort Washington CDP, MD· Prince George's County | 54,441 |
| 12 | 20772 | Croom CDP, MD· Prince George's County | 54,319 |
| 13 | 20902 | Wheaton CDP, MD· Montgomery County | 54,261 |
| 14 | 21215 | Baltimore, MD· Baltimore city | 52,229 |
| 15 | 20774 | Brock Hall CDP, MD· Prince George's County | 51,816 |
| 16 | 20854 | Potomac CDP, MD· Montgomery County | 50,498 |
| 17 | 21228 | Catonsville CDP, MD· Baltimore County | 50,492 |
| 18 | 20850 | Rockville, MD· Montgomery County | 50,353 |
| 19 | 20783 | Adelphi CDP, MD· Prince George's County | 50,333 |
| 20 | 21702 | Frederick, MD· Frederick County | 49,605 |
| 21 | 21206 | Baltimore, MD· Baltimore city | 48,902 |
| 22 | 21043 | Ellicott City CDP, MD· Howard County | 48,525 |
| 23 | 20852 | North Bethesda CDP, MD· Montgomery County | 48,180 |
| 24 | 21224 | Baltimore, MD· Baltimore city | 47,465 |
| 25 | 21207 | Lochearn CDP, MD· Baltimore County | 47,099 |