21904 ZIP Code — Port Deposit, MD
Cecil County, Maryland
ZIP code 21904 is located in Port Deposit, Maryland, within Cecil County. It covers approximately 23.60 square miles and serves a population of 5,975 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410/667.
About ZIP code 21904
The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $298,800. Owner-occupancy is high at 87%, well above the national average.
Median household income is $89,797.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 29 minutes is near the national average.
Educational attainment is near the national average, with 25% of residents holding a bachelor's degree or higher.
5,975
population
23.60
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
21904 ZIP code map
Cities in ZIP code 21904
Below are the cities the US Postal Service accepts for ZIP code 21904. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Port Deposit | Acceptable |
| Port Deposit | Preferred |
Nearby ZIP codes
21917 Colora (3.1 mi)
21911 Rising Sun (3.2 mi)
21903 Perryville (4.1 mi)
21918 Conowingo (6.4 mi)
21078 Havre De Grace (6.6 mi)
21901 North East (7.4 mi)
21034 Darlington (7.8 mi)
19362 Nottingham (9 mi)
21028 Churchville (9.8 mi)
21921 Elkton (10.8 mi)
21001 Aberdeen (11.3 mi)
17563 Peach Bottom (11.7 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 5,975 |
| Population density | 253 / sq mi |
| State FIPS | 24 |
| County FIPS | 015 |
| Geography | |
|---|---|
| Land area | 23.60 sq mi |
| Water area | 2.53 sq mi |
| Latitude | 39.6289 |
| Longitude | -76.0700 |
| Timezone | Eastern (ET) |
| Area code | 443/410/667 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 25.9% | 31.4% | 28.2% |
| $50k – $100k | 28.3% | 31.8% | 28.2% |
| $100k – $200k | 35.5% | 29.7% | 30.1% |
| Over $200k | 10.3% | 7.1% | 13.4% |
Demographics & statistics
5,975
Population
253
People per sq mi
43.4
Median age
$89,797
Median household income
$43,092
Per capita income
$298,800
Median home value
$1,158
Median monthly rent
86.7%
Home ownership
8.7%
Poverty rate
4.6%
Unemployment
2,422
Housing units
25.0%
Bachelor's or higher
Age distribution
Male
Female
158
Under 5
154
147
5–9
144
200
10–14
194
256
15–19
249
185
20–24
180
237
25–34
230
388
35–44
377
465
45–54
452
275
55–59
267
247
60–64
240
282
65–74
274
129
75–84
126
60
85+
59
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 1,277 | 21.4% |
| 18 and over | 4,698 | 78.6% |
| 65 and over | 930 | 15.6% |
| Median age | 43.4 years | |
Race & ethnicity
White
83.5%
Black or African American
7.1%
Two or more races
4.3%
Hispanic or Latino
3.9%
Other race
0.9%
Asian
0.2%
| Group | Count | % |
|---|---|---|
| White | 5,192 | 83.5% |
| Black or African American | 441 | 7.1% |
| Two or more races | 270 | 4.3% |
| Hispanic or Latino | 241 | 3.9% |
| Other race | 59 | 0.9% |
| Asian | 10 | 0.2% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 25.9% | 31.4% | 28.2% |
| $50k – $100k | 28.3% | 31.8% | 28.2% |
| $100k – $200k | 35.5% | 29.7% | 30.1% |
| Over $200k | 10.3% | 7.1% | 13.4% |
Under $10k
1.7%
$10k–$15k
3.7%
$15k–$25k
6.4%
$25k–$35k
5.8%
$35k–$50k
9.7%
$50k–$75k
19.1%
$75k–$100k
10.0%
$100k–$150k
21.6%
$150k–$200k
11.0%
$200k+
11.0%
| Range | % of households |
|---|---|
| Under $10k | 1.7% |
| $10k–$15k | 3.7% |
| $15k–$25k | 6.4% |
| $25k–$35k | 5.8% |
| $35k–$50k | 9.7% |
| $50k–$75k | 19.1% |
| $75k–$100k | 10.0% |
| $100k–$150k | 21.6% |
| $150k–$200k | 11.0% |
| $200k+ | 11.0% |
| Median income | $89,797 |
Housing
Home values
Under $50k
7.5%
$50k–$100k
6.9%
$100k–$150k
0.6%
$150k–$200k
6.9%
$200k–$300k
28.4%
$300k–$500k
35.4%
$500k–$1M
12.6%
$1M+
1.7%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $298,800 |
| Median rent / month | $1,158 |
| Owner occupied | 86.7% |
| Renter occupied | 13.3% |
| Vacant | 14.4% |
| Single-family detached | 67.8% |
| Large apartment buildings | 1.6% |
| Mobile homes | 17.5% |
| Median rooms | 6.5 |
| Avg household size (owned) | 2.52 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 5.2% |
| 2000–2009 | 19.8% |
| 1990–1999 | 21.5% |
| 1980–1989 | 20.7% |
| 1970–1979 | 8.6% |
| 1960–1969 | 7.4% |
| 1950–1959 | 2.9% |
| 1940–1949 | 1.7% |
| 1939 or earlier | 12.3% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.1% |
| 1 bedroom | 3.3% |
| 2 bedrooms | 24.5% |
| 3 bedrooms | 43.8% |
| 4 bedrooms | 23.8% |
| 5+ bedrooms | 4.5% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 4.4% |
| 1 vehicle | 25.1% |
| 2 vehicles | 35.4% |
| 3 or more | 35.1% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 1.8% |
| Electricity | 39.7% |
| Propane / LP gas | 27.2% |
| Fuel oil | 25.2% |
| Wood | 3.0% |
| No fuel used | 0.6% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 1,189 | 50.9% |
| Cohabiting couple | 166 | 7.1% |
| Male householder, no spouse | 417 | 17.8% |
| Female householder, no spouse | 566 | 24.2% |
| Households with children under 18 | 697 | 29.8% |
| Households with seniors (65+) | 656 | 28.1% |
| Average household size | 2.54 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 34.6% | 28.0% |
| Married | 50.3% | 51.3% |
| Separated | 3.4% | 1.2% |
| Widowed | 1.5% | 12.2% |
| Divorced | 10.3% | 7.3% |
Education
Less than 9th grade
3.0%
Some HS, no diploma
8.1%
HS graduate
35.5%
Some college, no degree
25.5%
Associate's degree
2.8%
Bachelor's degree
12.3%
Graduate / professional
12.7%
| Metric | % |
|---|---|
| HS diploma or higher | 88.8% |
| Bachelor's or higher | 25.0% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 145 | 9.3% |
| Kindergarten | 46 | 3.0% |
| Elementary school | 526 | 33.8% |
| High school | 531 | 34.1% |
| College / grad school | 310 | 19.9% |
Employment
Industry of employment
Education & healthcare
16.9%
Retail trade
16.0%
Professional & management
12.6%
Arts, food & hospitality
11.2%
Construction
9.6%
Manufacturing
9.1%
Transportation & utilities
7.1%
Public administration
6.5%
Finance & real estate
4.7%
Wholesale trade
2.6%
Other services
2.0%
Information
0.9%
Agriculture & mining
0.7%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 29.6% |
| Service | 15.3% |
| Sales & office | 27.6% |
| Natural resources & construction | 10.2% |
| Production & transportation | 17.4% |
Employment type
| Type | % |
|---|---|
| Private sector | 77.6% |
| Government | 16.0% |
| Self-employed | 6.4% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 77.2% |
| Carpool | 9.2% |
| Public transit | 0.4% |
| Walk | 4.4% |
| Work from home | 7.2% |
| Other means | 1.6% |
| Avg commute (minutes) | 28.9 |
Poverty
All people
8.7%
Under 18 years
17.1%
18 and over
6.4%
Married-couple families
1.4%
Female-led households
22.8%
Income support
| Source | % of households |
|---|---|
| Social Security | 25.7% |
| Retirement income | 33.4% |
| Supplemental Security | 2.5% |
| Cash public assistance | 4.9% |
| Food stamps / SNAP | 10.9% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 38.7% |
| High blood pressure | 36.2% |
| High cholesterol | 34.4% |
| Diabetes | 9.8% |
| Heart disease | 5.7% |
| Stroke | 2.8% |
| Asthma | 9.8% |
| Arthritis | 25.8% |
| Kidney disease | 2.5% |
| Pulmonary disease | 6.8% |
| Cancer | 6.3% |
| Behavior / access | % |
|---|---|
| Smoking | 19.8% |
| Binge drinking | 16.6% |
| No physical activity | 25.0% |
| Less than 7 hrs sleep | 36.1% |
| Depression | 20.8% |
| Fair or poor health | 13.3% |
| Poor mental health | 15.2% |
| Poor physical health | 9.6% |
| No health insurance | 10.6% |
| Visited doctor (checkup) | 73.7% |
| Visited dentist | 62.7% |
| Cholesterol screening | 90.9% |
| Teeth loss | 12.5% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 492 | 10.5% |
| Disability | % |
|---|---|
| Any disability | 15.1% |
| Under 18 | 3.8% |
| 18–64 years | 11.4% |
| 65 and over | 46.1% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 77.1% |
| Public insurance | 37.7% |
| No insurance | 4.5% |
| Uninsured under 19 | 3.4% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 5,663 | 94.8% |
| Spanish | 50 | 0.9% |
| Other Indo-European | 48 | 0.8% |
| Asian & Pacific Islander | 2 | 0.0% |
| Other languages | 0 | 0.0% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 5,772 | 96.6% |
| Born in same state | 5,719 | 95.7% |
| Born in different state | 3,789 | 63.4% |
| Foreign born | 53 | 0.9% |
| Naturalized citizen | 203 | 3.4% |
| Not a US citizen | 55 | 27.1% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 1,184 | 19.8% |
| French | 952 | 15.9% |
| Arab | 470 | 7.9% |
| English | 72 | 1.2% |
| Ancestry | Count | % |
|---|---|---|
| Polish | 28 | 0.5% |
| Irish | 14 | 0.2% |
| Norwegian | 13 | 0.2% |
| Dutch | 10 | 0.2% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 39.1% |
| Internet access | 95.7% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 21904
What city is ZIP code 21904 in?
ZIP code 21904 is primarily assigned to Port Deposit, Maryland.
What county is ZIP code 21904 in?
ZIP code 21904 falls within Cecil County, Maryland.
Is ZIP code 21904 mostly owner-occupied?
87% of occupied units in ZIP code 21904 are owner-occupied, well above the national average.
Does ZIP code 21904 have a large veteran population?
11% of civilians in ZIP code 21904 are veterans, above the national average of ~7%.
What is the population of ZIP code 21904?
ZIP code 21904 has an estimated population of 5,975 residents, with a density of 253 people per square mile.
What is the typical home value in ZIP code 21904?
The median home value in ZIP code 21904 is $298,800.
What timezone is ZIP code 21904 in?
ZIP code 21904 observes the EST timezone.