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Maryland ZIP Codes
Saint Marys County
Saint Inigoes, MD
20684
20684 ZIP Code — Saint Inigoes, MD
Saint Marys County, Maryland
ZIP code 20684 is located in
Saint Inigoes ,
Maryland ,
within Saint Marys County .
It covers approximately 8.34 square miles and serves a population of
627 residents.
This is a standard ZIP code in the Eastern (ET) timezone,
served by area code 240/301 .
About ZIP code 20684
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Median home value is $397,900. Owner-occupancy is high at 86%, well above the national average.
Median household income is $137,188. 60% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with public administration as the leading industry. The average commute of 16 minutes is near the national average. Remote work is prevalent — 32% of workers work from home.
Educational attainment is high — 65% of residents hold a bachelor's degree or higher, well above the national average of 33%.
Notable community characteristics include a notable veteran presence at 15% of civilians, above the national average of 7%; and disability rates above the national average at 23%.
Overall, ZIP code 20684 reflects a community defined by a highly educated population, a strong veteran community, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.
20684 ZIP code map
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Cities in ZIP code 20684
Below are the cities the US Postal Service accepts for ZIP code 20684. Using any city not on this list may result in mail delivery delays.
Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
627
Population density
75 / sq mi
State FIPS
24
County FIPS
037
Geography
Land area
8.34 sq mi
Water area
3.39 sq mi
Latitude
38.1403
Longitude
-76.4082
Timezone
Eastern (ET)
Area code
240/301
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
21.8%
24.3%
28.2%
$50k – $100k
23.0%
27.4%
28.2%
$100k – $200k
26.9%
36.2%
30.1%
Over $200k
28.4%
12.1%
13.4%
Demographics & statistics
$137,188
Median household income
$397,900
Median home value
64.9%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 33 5.3% 18 and over 594 94.7% 65 and over 252 40.2% Median age 57.0 years
Race & ethnicity
Black or African American
1.6%
Group Count % White 582 92.7% Two or more races 35 5.6% Black or African American 10 1.6% Hispanic or Latino 1 0.2%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
21.8%
24.3%
28.2%
$50k – $100k
23.0%
27.4%
28.2%
$100k – $200k
26.9%
36.2%
30.1%
Over $200k
28.4%
12.1%
13.4%
Range % of households $10k–$15k 1.0% $35k–$50k 26.9% $50k–$75k 15.0% $75k–$100k 1.3% $100k–$150k 12.3% $150k–$200k 28.6% $200k+ 15.0% Median income $137,188
Housing
Housing overview
Metric Value Median home value $397,900 Median rent / month $0 Owner occupied 86.4% Renter occupied 13.6% Vacant 0.0% Single-family detached 87.0% Large apartment buildings 0.0% Mobile homes 0.0% Median rooms 7.3 Avg household size (owned) 2.24
Year built
Era % 2020 or later 0.0% 2010–2019 18.9% 2000–2009 11.6% 1990–1999 17.6% 1980–1989 20.6% 1970–1979 0.0% 1960–1969 1.0% 1950–1959 5.0% 1940–1949 23.9% 1939 or earlier 1.3%
Bedrooms
Size % of units No bedroom (studio) 0.0% 1 bedroom 0.0% 2 bedrooms 7.6% 3 bedrooms 24.6% 4 bedrooms 67.8% 5+ bedrooms 0.0%
Vehicles per household
Vehicles % of households No vehicle 0.0% 1 vehicle 14.6% 2 vehicles 50.8% 3 or more 34.6%
Heating fuel
Fuel type % Utility gas 1.3% Electricity 55.8% Propane / LP gas 9.6% Fuel oil 20.9% Wood 12.3%
Households & families
Household type Count % Married-couple family 216 71.8% Cohabiting couple 0 0.0% Male householder, no spouse 41 13.6% Female householder, no spouse 44 14.6% Households with children under 18 18 6.0% Households with seniors (65+) 153 50.8% Average household size 2.07
Marital status
Status Male Female Never married 18.4% 14.3% Married 75.2% 62.7% Separated 6.5% 0.0% Widowed 0.0% 8.7% Divorced 0.0% 14.3%
Education
Some college, no degree
14.3%
Graduate / professional
18.9%
Metric % HS diploma or higher 100.0% Bachelor's or higher 64.9%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 0 0.0% Kindergarten 0 0.0% Elementary school 33 56.9% High school 0 0.0% College / grad school 25 43.1%
Employment
Industry of employment
Public administration
30.0%
Education & healthcare
19.2%
Professional & management
15.8%
Agriculture & mining
6.8%
Arts, food & hospitality
4.3%
Occupation
Category % Management, business & arts 59.4% Service 5.6% Sales & office 22.9% Natural resources & construction 8.0% Production & transportation 4.0%
Employment type
Type % Private sector 42.7% Government 42.7% Self-employed 0.9% Unpaid family workers 13.6%
Commute
Method % Drive alone 62.5% Carpool 0.0% Public transit 0.0% Walk 5.5% Work from home 32.0% Other means 0.0% Avg commute (minutes) 15.5
Poverty
Married-couple families
0.0%
Female-led households
14.3%
Income support
Source % of households Social Security 60.1% Retirement income 33.9% Supplemental Security 9.3% Cash public assistance 0.0% Food stamps / SNAP 9.3%
Health indicators
Condition % Obesity 36.5% High blood pressure 37.4% High cholesterol 36.9% Diabetes 10.9% Heart disease 6.4% Stroke 3.0% Asthma 10.0% Arthritis 28.1% Kidney disease 2.8% Pulmonary disease 6.2% Cancer 7.3%
Behavior / access % Smoking 15.1% Binge drinking 14.8% No physical activity 21.4% Less than 7 hrs sleep 35.0% Depression 17.0% Fair or poor health 11.8% Poor mental health 13.4% Poor physical health 8.7% No health insurance 8.8% Visited doctor (checkup) 78.2% Visited dentist 70.5% Cholesterol screening 92.7% Teeth loss 10.8%
Veterans & disability
Veterans Count % Civilian veterans 90 15.2%
Disability % Any disability 22.8% Under 18 0.0% 18–64 years 20.7% 65 and over 28.6%
Health insurance coverage
Type % Private insurance 85.2% Public insurance 48.0% No insurance 0.0% Uninsured under 19 0.0%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 627 100.0% Spanish 1 0.2% Other Indo-European 1 0.2% Asian & Pacific Islander 0 0.0% Other languages 0 0.0%
Place of birth & citizenship
Origin Count % Native born (US) 623 99.4% Born in same state 623 99.4% Born in different state 177 28.2% Foreign born 0 0.0% Naturalized citizen 4 0.6% Not a US citizen 4 100.0%
Ancestry
Ancestry Count % French 210 33.5% Italian 87 13.9%
Technology access
Metric % of households Computer access 48.0% Internet access 85.4%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 20684
What city is ZIP code 20684 in?
ZIP code 20684 is primarily assigned to Saint Inigoes, Maryland.
What county is ZIP code 20684 in?
ZIP code 20684 falls within Saint Marys County, Maryland.
Does ZIP code 20684 have an older population?
40% of residents in ZIP code 20684 are 65 or older, above the national average of ~17%.
Does ZIP code 20684 have a large retiree population?
60% of households in ZIP code 20684 receive Social Security income, suggesting a significant retiree or disability population.
How educated is the population of ZIP code 20684?
65% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.
Is ZIP code 20684 mostly owner-occupied?
86% of occupied units in ZIP code 20684 are owner-occupied, well above the national average.
What timezone is ZIP code 20684 in?
ZIP code 20684 observes the EST timezone.
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