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. Anne Arundel County
5. Howard County
6. Harford County
7. Frederick County
8. Carroll County
9. Charles County
10. Washington County

Largest 10 Cities by Population

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

Largest 10 Zip Codes by Population

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