21770Monrovia, MD
Prospecting data for 21770: Monrovia, MD
Zip 21770 in Monrovia, Maryland has about 2,640 homeowners. About 820 have a connected mobile phone and 300 of those are clear of the National Do Not Call Registry.
Absentee owners 21770
Data as of 2026-09
- Absentee owners130
- Mailable address99%120
- Connected mobile6%under 100
- Email on file12%under 100
- Mobile and DNC clear4%under 100
Rounded floors, not promises.
| Population | 5,510 |
|---|---|
| Housing units | 1,990 |
| Owner occupied | 96% of occupied homes |
| Renter occupied | 4% of occupied homes |
| Median household income | $139,000 |
| Median age | 44.3 |
| Built before 1970 | 10% of homes |
| Built 2000 or later | 18% of homes |
| Median mortgage payment | $2,280 a month |
| Time zone | EST |
| Area code | 301 |
Census figures are rounded ACS 5-year estimates for the zip code tabulation area.
What this means for each channel
Direct mail reaches almost everyone: 98% of 21770 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Monrovia campaign.
Calling and texting reach about 31% with a connected mobile, but only 11% once you remove numbers on the National Do Not Call Registry. Texting a cold list also needs prior express written consent under the TCPA, so the DNC-clear figure is a calling figure, not a texting figure. See cold calling laws by state.
Email reaches about 46%. Cold email to consumers is legal under CAN-SPAM with an opt-out and a physical address, but deliverability on purchased consumer email is poor; treat it as a supporting touch.
→Nearby
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