Maryland ZIP Codes: Ranges, Prefixes and Major Cities
Whether you are building an address form, cleaning a mailing list or testing shipping rules, it helps to know how ZIP codes work in Maryland. The state has 603 active codes spread across 26 counties.
ZIP code range and prefixes
Every Maryland ZIP code starts with one of 14 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.
- 205
- 206
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- 210
- 211
- 212
- 214
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- 219
Types of ZIP codes in Maryland
| Type | Count | What it covers |
|---|---|---|
| Standard | 423 | Street delivery areas |
| PO Box | 141 | Post office boxes only |
| Unique | 39 | A single high-volume organization |
ZIP codes for major Maryland cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Baltimore | Baltimore city | 23 | 21201–21287 |
| Silver Spring | Montgomery County | 7 | 20901–20910 |
| Annapolis | Anne Arundel County | 6 | 21401–21412 |
| Hyattsville | Prince George's County | 5 | 20781–20785 |
| Bowie | Prince George's County | 4 | 20715–20721 |
| Frederick | Frederick County | 4 | 21701–21704 |
| Gaithersburg | Montgomery County | 4 | 20877–20882 |
| Laurel | Prince George's County | 4 | 20707–20724 |
| Rockville | Montgomery County | 4 | 20850–20853 |
| Bethesda | Montgomery County | 3 | 20814–20817 |
| Columbia | Howard County | 3 | 21044–21046 |
| Waldorf | Charles County | 3 | 20601–20603 |
| Bel Air | Harford County | 2 | 21014–21015 |
| Ellicott City | Howard County | 2 | 21042–21043 |
| Germantown | Montgomery County | 2 | 20874–20876 |
Annapolis is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.
Sample addresses
Jessica Lee
9701 Sunset Ln
Germantown, MD 20874
Barbara Davis
9229 Oak Pl
Waldorf, MD 20603
Emily Smith
1127 Lake Way
Annapolis, MD 21409
These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.
Tips for working with these ZIP codes
- Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
- All of Maryland is in the Eastern time zone, which keeps scheduling logic simple.
- A quick sanity check: a valid MD ZIP code begins with one of the prefixes listed above.
- City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.
Create realistic Maryland addresses for testing, with real cities, counties and ZIP codes.
Generate Maryland addresses