20879Gaithersburg, MD
Prospecting data for 20879: Gaithersburg, MD
Zip 20879 in Gaithersburg, Maryland has about 5,690 homeowners. About 1,780 have a connected mobile phone and 950 of those are clear of the National Do Not Call Registry.
Absentee owners 20879
Data as of 2026-09
- Absentee owners1,200
- Mailable address98%1,180
- Connected mobile7%under 100
- Email on file10%110
- Mobile and DNC clear3%under 100
Rounded floors, not promises.
| Population | 26,200 |
|---|---|
| Housing units | 8,540 |
| Owner occupied | 69% of occupied homes |
| Renter occupied | 31% of occupied homes |
| Median household income | $89,000 |
| Median age | 34.8 |
| Built before 1970 | 6% of homes |
| Built 2000 or later | 9% of homes |
| Median mortgage payment | $1,940 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: 97% of 20879 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Gaithersburg campaign.
Calling and texting reach about 31% with a connected mobile, but only 17% 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 45%. 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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