21105 ZIP Code — Maryland Line, MD
Baltimore County, Maryland
ZIP code 21105 is located in Maryland Line, Maryland, within Baltimore County. It covers approximately 0.09 square miles and serves a population of 40 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410.
40
population
0.09
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
21105 ZIP code map
Cities in ZIP code 21105
Below are the cities the US Postal Service accepts for ZIP code 21105. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Maryland Line | Acceptable |
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 40 |
| Population density | 444 / sq mi |
| State FIPS | 24 |
| County FIPS | 005 |
| Geography | |
|---|---|
| Land area | 0.09 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 39.7121 |
| Longitude | -76.6497 |
| Timezone | Eastern (ET) |
| Area code | 443/410 |
Total population by age
Gender
Race & ethnicity
Demographics & statistics
40
Population
444
People per sq mi
0.0
Median age
$0
Median household income
$0
Per capita income
$0
Median home value
$0
Median monthly rent
0.0%
Home ownership
0.0%
Poverty rate
0.0%
Unemployment
0
Housing units
40.0%
Bachelor's or higher
Age distribution
Male
Female
16
65–74
24
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 0 | 0.0% |
| 18 and over | 40 | 100.0% |
| 65 and over | 40 | 100.0% |
| Median age | 0.0 years | |
Race & ethnicity
Hispanic or Latino
37.5%
Two or more races
37.5%
White
25%
| Group | Count | % |
|---|---|---|
| Hispanic or Latino | 24 | 37.5% |
| Two or more races | 24 | 37.5% |
| White | 16 | 25% |
Household income
$15k–$25k
100.0%
| Range | % of households |
|---|---|
| $15k–$25k | 100.0% |
| Median income | $0 |
Housing
Home values
Housing overview
| Metric | Value |
|---|---|
| Median home value | $0 |
| Median rent / month | $0 |
| Owner occupied | 0.0% |
| Renter occupied | 100.0% |
| Vacant | 0.0% |
| Single-family detached | 100.0% |
| Large apartment buildings | 0.0% |
| Mobile homes | 0.0% |
| Median rooms | 0.0 |
| Avg household size (owned) | 0.00 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 0.0% |
| 2000–2009 | 0.0% |
| 1990–1999 | 0.0% |
| 1980–1989 | 0.0% |
| 1970–1979 | 0.0% |
| 1960–1969 | 0.0% |
| 1950–1959 | 0.0% |
| 1940–1949 | 0.0% |
| 1939 or earlier | 100.0% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 0.0% |
| 2 bedrooms | 0.0% |
| 3 bedrooms | 100.0% |
| 4 bedrooms | 0.0% |
| 5+ bedrooms | 0.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.0% |
| 1 vehicle | 0.0% |
| 2 vehicles | 0.0% |
| 3 or more | 100.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Fuel oil | 100.0% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 16 | 100.0% |
| Cohabiting couple | 0 | 0.0% |
| Male householder, no spouse | 0 | 0.0% |
| Female householder, no spouse | 0 | 0.0% |
| Households with children under 18 | 0 | 0.0% |
| Households with seniors (65+) | 16 | 100.0% |
| Average household size | 2.50 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 0.0% | 0.0% |
| Married | 100.0% | 100.0% |
| Separated | 0.0% | 0.0% |
| Widowed | 0.0% | 0.0% |
| Divorced | 0.0% | 0.0% |
Education
Less than 9th grade
0.0%
Some HS, no diploma
0.0%
HS graduate
0.0%
Some college, no degree
60.0%
Associate's degree
0.0%
Bachelor's degree
40.0%
Graduate / professional
0.0%
| Metric | % |
|---|---|
| HS diploma or higher | 100.0% |
| Bachelor's or higher | 40.0% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 0 | 0.0% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 0 | 0.0% |
| High school | 0 | 0.0% |
| College / grad school | 0 | 0.0% |
Employment
Industry of employment
Occupation
| Category | % |
|---|---|
| Management, business & arts | 0.0% |
| Service | 0.0% |
| Sales & office | 0.0% |
| Natural resources & construction | 0.0% |
| Production & transportation | 0.0% |
Employment type
| Type | % |
|---|---|
| Private sector | 0.0% |
| Government | 0.0% |
| Self-employed | 0.0% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 0.0% |
| Carpool | 0.0% |
| Public transit | 0.0% |
| Walk | 0.0% |
| Work from home | 0.0% |
| Other means | 0.0% |
| Avg commute (minutes) | 0.0 |
Poverty
All people
0.0%
Under 18 years
0.0%
18 and over
0.0%
Married-couple families
0.0%
Female-led households
0.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 100.0% |
| Retirement income | 100.0% |
| Supplemental Security | 0.0% |
| Cash public assistance | 0.0% |
| Food stamps / SNAP | 0.0% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 26.8% |
| High blood pressure | 23.5% |
| High cholesterol | 26.4% |
| Diabetes | 5.5% |
| Heart disease | 3.6% |
| Stroke | 1.6% |
| Asthma | 9.1% |
| Arthritis | 17.0% |
| Kidney disease | 1.8% |
| Pulmonary disease | 3.5% |
| Cancer | 5.0% |
| Behavior / access | % |
|---|---|
| Smoking | 11.5% |
| Binge drinking | 19.5% |
| No physical activity | 16.7% |
| Less than 7 hrs sleep | 29.0% |
| Depression | 19.6% |
| Fair or poor health | 8.1% |
| Poor mental health | 14.7% |
| Poor physical health | 5.9% |
| No health insurance | 10.1% |
| Visited doctor (checkup) | 72.3% |
| Visited dentist | 71.9% |
| Cholesterol screening | 90.6% |
| Teeth loss | 7.4% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 0 | 0.0% |
| Disability | % |
|---|---|
| Any disability | 40.0% |
| Under 18 | 0.0% |
| 18–64 years | 0.0% |
| 65 and over | 40.0% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 0.0% |
| Public insurance | 100.0% |
| No insurance | 0.0% |
| Uninsured under 19 | 0.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 40 | 100.0% |
| Spanish | 0 | 0.0% |
| Other Indo-European | 0 | 0.0% |
| Asian & Pacific Islander | 0 | 0.0% |
| Other languages | 0 | 0.0% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 40 | 100.0% |
| Born in same state | 16 | 40.0% |
| Born in different state | 16 | 40.0% |
| Foreign born | 24 | 60.0% |
| Naturalized citizen | 0 | 0.0% |
| Not a US citizen | 0 | 0.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Arab | 16 | 40% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 40.0% |
| Internet access | 100.0% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 21105
What city is ZIP code 21105 in?
ZIP code 21105 is primarily assigned to Maryland Line, Maryland.
What county is ZIP code 21105 in?
ZIP code 21105 falls within Baltimore County, Maryland.
Does ZIP code 21105 have an older population?
100% of residents in ZIP code 21105 are 65 or older, above the national average of ~17%.
Does ZIP code 21105 have a large retiree population?
100% of households in ZIP code 21105 receive Social Security income, suggesting a significant retiree or disability population.
What share of ZIP code 21105 residents are foreign-born?
60% of residents in ZIP code 21105 are foreign-born, well above the national average of ~14%.
What is the population of ZIP code 21105?
ZIP code 21105 has an estimated population of 40 residents, with a density of 465 people per square mile.
What timezone is ZIP code 21105 in?
ZIP code 21105 observes the EST timezone.