Maryland Phone Carrier & TCPA/DNC Compliance Data
Carrier mix, line types, and calling-compliance rules for Maryland, drawn from 1,433 analyzed MD phone numbers. Use it to bulk-validate and DNC-scrub Maryland calling lists before you dial.
TCPA & DNC calling rules in Maryland
- Permitted calling window: 8:00 AM – 9:00 PM local (federal TCPA baseline)
- State Do-Not-Call registry: No separate state list — the federal DNC registry applies.
- Federal baseline: TCPA prior-express-consent rules and the national DNC registry apply to Maryland outbound calling.
Informational only — not legal advice. Verify current federal and Maryland regulations before running any campaign.
Carrier mix in Maryland
The most common carriers across analyzed Maryland numbers:
| Carrier | Numbers analyzed |
|---|---|
| Verizon Wireless | 748 |
| AT&T | 347 |
| T-Mobile | 308 |
| Bandwidth.com | 13 |
| U.S. Cellular | 5 |
| Onvoy | 3 |
| Emergency Networks | 2 |
| Dish Wireless | 2 |
| CSC Wireless | 2 |
| Verizon | 2 |
Line types in Maryland
Line-type distribution matters for compliance — wireless numbers carry stricter TCPA autodialer rules than landlines.
| Line type | Numbers analyzed |
|---|---|
| WIRELESS | 1,107 |
| PCS | 308 |
| CLEC | 16 |
| RBOC | 2 |
Top Maryland cities by number volume
| City | Numbers analyzed |
|---|---|
| Baltimore | 272 |
| District Heights | 196 |
| Laurel | 103 |
| Frederick | 76 |
| Catonsville | 74 |
| Glen Echo | 74 |
| Salisbury | 54 |
| Chewsville | 43 |
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