21045Columbia, MD
Prospecting data for 21045: Columbia, MD
Zip 21045 in Columbia, Maryland has about 9,660 homeowners. About 3,580 have a connected mobile phone and 1,410 of those are clear of the National Do Not Call Registry.
Absentee owners 21045
Data as of 2026-09
- Absentee owners1,620
- Mailable address97%1,570
- Connected mobile8%130
- Email on file10%170
- Mobile and DNC clear4%under 100
Rounded floors, not promises.
| Population | 40,400 |
|---|---|
| Housing units | 15,800 |
| Owner occupied | 71% of occupied homes |
| Renter occupied | 29% of occupied homes |
| Median household income | $104,000 |
| Median age | 37.2 |
| Built before 1970 | 8% of homes |
| Built 2000 or later | 6% of homes |
| Median mortgage payment | $2,170 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: 95% of 21045 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Columbia campaign.
Calling and texting reach about 37% with a connected mobile, but only 15% 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 47%. 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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