21090Linthicum Heights, MD
Prospecting data for 21090: Linthicum Heights, MD
Zip 21090 in Linthicum Heights, Maryland has about 3,060 homeowners. About 1,000 have a connected mobile phone and 380 of those are clear of the National Do Not Call Registry.
Absentee owners 21090
Data as of 2026-09
- Absentee owners230
- Mailable address100%220
- Connected mobile12%under 100
- Email on file8%under 100
- Mobile and DNC clear4%under 100
Rounded floors, not promises.
| Population | 9,990 |
|---|---|
| Housing units | 3,940 |
| Owner occupied | 82% of occupied homes |
| Renter occupied | 18% of occupied homes |
| Median household income | $97,000 |
| Median age | 42.1 |
| Built before 1970 | 72% of homes |
| Built 2000 or later | 7% of homes |
| Median mortgage payment | $1,950 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: 97% of 21090 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Linthicum Heights campaign.
Calling and texting reach about 33% with a connected mobile, but only 12% 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 49%. 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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