21057Glen Arm, MD

Prospecting data for 21057: Glen Arm, MD

Name: Prospecting data for 21057: Glen Arm, MD
Creator: Prospecting Data
License: https://prospectingdata.com/about/

Zip 21057 in Glen Arm, Maryland has about 1,330 homeowners. About 530 have a connected mobile phone and 180 of those are clear of the National Do Not Call Registry.

Data as of 2026-09Baltimore County

Absentee owners 21057

Data as of 2026-09

Absentee owners140
Mailable address99%130
Connected mobile7%under 100
Email on file13%under 100
Mobile and DNC clear2%under 100

Rounded floors, not promises.

Who lives here
Population	4,230
Housing units	1,720
Owner occupied	86% of occupied homes
Renter occupied	14% of occupied homes
Median household income	$131,000
Median age	51.4
Built before 1970	54% of homes
Built 2000 or later	7% of homes
Median mortgage payment	$2,650 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 21057 homeowners have a deliverable mailing address. Mail is the only channel with no consent requirement, so it is the floor of any Glen Arm campaign.

Calling and texting reach about 40% with a connected mobile, but only 13% 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 59%. 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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