21648 ZIP Code — Madison, MD
Dorchester County, Maryland
ZIP code 21648 is located in Madison, Maryland, within Dorchester County. It covers approximately 9.38 square miles and serves a population of 181 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 667.
181
population
9.38
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
21648 ZIP code map
Cities in ZIP code 21648
Below are the cities the US Postal Service accepts for ZIP code 21648. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Madison | Acceptable |
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 181 |
| Population density | 19 / sq mi |
| State FIPS | 24 |
| County FIPS | 019 |
| Geography | |
|---|---|
| Land area | 9.38 sq mi |
| Water area | 4.69 sq mi |
| Latitude | 38.4900 |
| Longitude | -76.2353 |
| Timezone | Eastern (ET) |
| Area code | 667 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 18.4% | 48.7% | 28.2% |
| $50k – $100k | 24.5% | 30.4% | 28.2% |
| $100k – $200k | 49.0% | 17.3% | 30.1% |
| Over $200k | 8.2% | 3.7% | 13.4% |
Demographics & statistics
181
Population
19
People per sq mi
48.2
Median age
$137,500
Median household income
$46,399
Per capita income
$156,700
Median home value
$0
Median monthly rent
92.1%
Home ownership
15.4%
Poverty rate
0.0%
Unemployment
84
Housing units
17.9%
Bachelor's or higher
Age distribution
Male
Female
3
Under 5
3
5
5–9
5
1
10–14
1
2
15–19
2
10
20–24
9
26
25–34
22
11
45–54
9
19
60–64
15
18
65–74
15
3
75–84
2
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 20 | 11.0% |
| 18 and over | 161 | 89.0% |
| 65 and over | 38 | 21.0% |
| Median age | 48.2 years | |
Race & ethnicity
White
90.1%
Asian
6.6%
Black or African American
2.2%
Hispanic or Latino
0.5%
Other race
0.5%
| Group | Count | % |
|---|---|---|
| White | 164 | 90.1% |
| Asian | 12 | 6.6% |
| Black or African American | 4 | 2.2% |
| Hispanic or Latino | 1 | 0.5% |
| Other race | 1 | 0.5% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 18.4% | 48.7% | 28.2% |
| $50k – $100k | 24.5% | 30.4% | 28.2% |
| $100k – $200k | 49.0% | 17.3% | 30.1% |
| Over $200k | 8.2% | 3.7% | 13.4% |
Under $10k
6.6%
$10k–$15k
7.9%
$35k–$50k
19.7%
$50k–$75k
7.9%
$100k–$150k
7.9%
$150k–$200k
38.2%
$200k+
11.8%
| Range | % of households |
|---|---|
| Under $10k | 6.6% |
| $10k–$15k | 7.9% |
| $35k–$50k | 19.7% |
| $50k–$75k | 7.9% |
| $100k–$150k | 7.9% |
| $150k–$200k | 38.2% |
| $200k+ | 11.8% |
| Median income | $137,500 |
Housing
Home values
$50k–$100k
7.1%
$100k–$150k
37.1%
$150k–$200k
21.4%
$200k–$300k
12.9%
$500k–$1M
21.4%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $156,700 |
| Median rent / month | $0 |
| Owner occupied | 92.1% |
| Renter occupied | 7.9% |
| Vacant | 15.6% |
| Single-family detached | 100.0% |
| Large apartment buildings | 0.0% |
| Mobile homes | 0.0% |
| Median rooms | 4.7 |
| Avg household size (owned) | 2.19 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 10.0% |
| 2000–2009 | 6.7% |
| 1990–1999 | 10.0% |
| 1980–1989 | 0.0% |
| 1970–1979 | 28.9% |
| 1960–1969 | 6.7% |
| 1950–1959 | 15.6% |
| 1940–1949 | 22.2% |
| 1939 or earlier | 0.0% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 0.0% |
| 2 bedrooms | 44.4% |
| 3 bedrooms | 50.0% |
| 4 bedrooms | 5.6% |
| 5+ bedrooms | 0.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.0% |
| 1 vehicle | 14.5% |
| 2 vehicles | 60.5% |
| 3 or more | 25.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Electricity | 73.7% |
| Propane / LP gas | 19.7% |
| Fuel oil | 6.6% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 59 | 77.6% |
| Cohabiting couple | 0 | 0.0% |
| Male householder, no spouse | 5 | 6.6% |
| Female householder, no spouse | 12 | 15.8% |
| Households with children under 18 | 6 | 7.9% |
| Households with seniors (65+) | 32 | 42.1% |
| Average household size | 2.30 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 32.6% | 8.5% |
| Married | 62.0% | 83.1% |
| Separated | 5.4% | 0.0% |
| Widowed | 0.0% | 0.0% |
| Divorced | 0.0% | 8.5% |
Education
Less than 9th grade
0.0%
Some HS, no diploma
0.0%
HS graduate
25.0%
Some college, no degree
37.1%
Associate's degree
20.0%
Bachelor's degree
10.0%
Graduate / professional
7.9%
| Metric | % |
|---|---|
| HS diploma or higher | 100.0% |
| Bachelor's or higher | 17.9% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 0 | 0.0% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 12 | 60.0% |
| High school | 3 | 15.0% |
| College / grad school | 5 | 25.0% |
Employment
Industry of employment
Education & healthcare
21.5%
Construction
19.0%
Retail trade
16.5%
Arts, food & hospitality
14.9%
Wholesale trade
12.4%
Finance & real estate
11.6%
Professional & management
4.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 53.7% |
| Service | 13.2% |
| Sales & office | 5.8% |
| Natural resources & construction | 27.3% |
| Production & transportation | 0.0% |
Employment type
| Type | % |
|---|---|
| Private sector | 95.0% |
| Government | 3.3% |
| Self-employed | 1.7% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 87.6% |
| Carpool | 12.4% |
| Public transit | 0.0% |
| Walk | 0.0% |
| Work from home | 0.0% |
| Other means | 0.0% |
| Avg commute (minutes) | 24.3 |
Poverty
All people
15.4%
Under 18 years
100.0%
18 and over
6.9%
Married-couple families
0.0%
Female-led households
50.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 42.1% |
| Retirement income | 13.2% |
| Supplemental Security | 0.0% |
| Cash public assistance | 0.0% |
| Food stamps / SNAP | 7.9% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 34.5% |
| High blood pressure | 40.1% |
| High cholesterol | 38.1% |
| Diabetes | 12.2% |
| Heart disease | 7.5% |
| Stroke | 3.3% |
| Asthma | 9.4% |
| Arthritis | 30.8% |
| Kidney disease | 3.2% |
| Pulmonary disease | 7.7% |
| Cancer | 9.1% |
| Behavior / access | % |
|---|---|
| Smoking | 14.4% |
| Binge drinking | 13.5% |
| No physical activity | 22.6% |
| Less than 7 hrs sleep | 29.7% |
| Depression | 18.8% |
| Fair or poor health | 13.0% |
| Poor mental health | 12.4% |
| Poor physical health | 9.4% |
| No health insurance | 8.8% |
| Visited doctor (checkup) | 81.6% |
| Visited dentist | 67.9% |
| Cholesterol screening | 93.7% |
| Teeth loss | 9.2% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 11 | 6.8% |
| Disability | % |
|---|---|
| Any disability | 0.0% |
| Under 18 | 0.0% |
| 18–64 years | 0.0% |
| 65 and over | 0.0% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 72.0% |
| Public insurance | 40.6% |
| No insurance | 0.0% |
| Uninsured under 19 | 0.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 175 | 96.7% |
| 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) | 169 | 93.4% |
| Born in same state | 169 | 93.4% |
| Born in different state | 155 | 85.6% |
| Foreign born | 0 | 0.0% |
| Naturalized citizen | 12 | 6.6% |
| Not a US citizen | 12 | 100.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 52 | 28.7% |
| Ancestry | Count | % |
|---|---|---|
| French | 31 | 17.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 42.0% |
| Internet access | 100.0% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 21648
What city is ZIP code 21648 in?
ZIP code 21648 is primarily assigned to Madison, Maryland.
What county is ZIP code 21648 in?
ZIP code 21648 falls within Dorchester County, Maryland.
Is ZIP code 21648 mostly owner-occupied?
92% of occupied units in ZIP code 21648 are owner-occupied, well above the national average.
Does ZIP code 21648 have a large retiree population?
42% of households in ZIP code 21648 receive Social Security income, suggesting a significant retiree or disability population.
What is the poverty rate in ZIP code 21648?
15% of residents in ZIP code 21648 live below the poverty line, above the national average.
What is the median household income in ZIP code 21648?
The median household income in ZIP code 21648 is $137,500, above the national median of ~$75,000.
What timezone is ZIP code 21648 in?
ZIP code 21648 observes the EST timezone.