Maryland Demographics Site Map

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Browse Maryland Zip Codes

• Zip Codes by Population

Largest 10 Counties by Population

1. Montgomery County
2. Prince George's County
3. Baltimore County
4. Baltimore city/county
5. Anne Arundel County
6. Howard County
7. Frederick County
8. Harford County
9. Carroll County
10. Charles County

Largest 10 Cities by Population

1. Baltimore
2. Columbia
3. Germantown
4. Silver Spring
5. Waldorf
6. Ellicott City
7. Frederick
8. Glen Burnie
9. Rockville
10. Gaithersburg

Largest 10 Zip Codes by Population

1. 20906
2. 21234
3. 20878
4. 21740
5. 20874
6. 21122
7. 21117
8. 21215
9. 20904
10. 21222