21837Mardela Springs, MD
Prospecting data for 21837: Mardela Springs, MD
Zip 21837 in Mardela Springs, Maryland has about 800 homeowners. About 230 have a connected mobile phone and under 100 of those are clear of the National Do Not Call Registry.
Absentee owners 21837
Data as of 2026-09
- Absentee owners240
- Mailable address100%240
- Connected mobile7%under 100
- Email on file16%under 100
- Mobile and DNC clear2%under 100
Rounded floors, not promises.
| Population | 3,200 |
|---|---|
| Housing units | 1,210 |
| Owner occupied | 81% of occupied homes |
| Renter occupied | 19% of occupied homes |
| Median household income | $74,000 |
| Median age | 39.2 |
| Built before 1970 | 43% of homes |
| Built 2000 or later | 20% of homes |
| Median mortgage payment | $1,320 a month |
| Time zone | EST |
| Area code | 410 |
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: 99% of 21837 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Mardela Springs campaign.
Calling and texting reach about 29% 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 50%. 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.
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