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Maine ZIP Codes
Somerset County
Smithfield, ME
04978
04978 ZIP Code — Smithfield, ME
Somerset County, Maine
ZIP code 04978 is located in
Smithfield ,
Maine ,
within Somerset County .
It covers approximately 19.90 square miles and serves a population of
943 residents.
This is a standard ZIP code in the Eastern (ET) timezone,
served by area code 207 .
About ZIP code 04978
The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $219,900. Owner-occupancy is high at 92%, well above the national average.
Median household income is $101,932. The poverty rate of 5% is below the national average. 51% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 32 minutes is near the national average.
Educational attainment is near the national average, with 32% of residents holding a bachelor's degree or higher.
Health indicators show elevated rates of smoking (21%) compared to national benchmarks.
Notable community characteristics include a notable veteran presence at 15% of civilians, above the national average of 7%.
Overall, ZIP code 04978 reflects a community defined by a strong veteran community, high homeownership, and a significant Social Security-dependent population.
04978 ZIP code map
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Cities in ZIP code 04978
Below are the cities the US Postal Service accepts for ZIP code 04978. Using any city not on this list may result in mail delivery delays.
Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
943
Population density
47 / sq mi
State FIPS
23
County FIPS
025
Geography
Land area
19.90 sq mi
Water area
4.86 sq mi
Latitude
44.6334
Longitude
-69.8065
Timezone
Eastern (ET)
Area code
207
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
28.6%
54.1%
42.3%
$50k – $100k
42.3%
31.8%
32.3%
$100k – $200k
24.2%
12.7%
20.6%
Over $200k
4.9%
1.4%
4.9%
Demographics & statistics
$101,932
Median household income
$219,900
Median home value
32.3%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 111 11.8% 18 and over 832 88.2% 65 and over 283 30.0% Median age 55.1 years
Race & ethnicity
Group Count % White 911 96.2% Two or more races 30 3.2% Hispanic or Latino 4 0.4% Other race 2 0.2%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
28.6%
54.1%
42.3%
$50k – $100k
42.3%
31.8%
32.3%
$100k – $200k
24.2%
12.7%
20.6%
Over $200k
4.9%
1.4%
4.9%
Range % of households $10k–$15k 1.9% $15k–$25k 3.3% $25k–$35k 5.4% $35k–$50k 11.0% $50k–$75k 15.5% $75k–$100k 11.0% $100k–$150k 34.4% $150k–$200k 10.8% $200k+ 6.8% Median income $101,932
Housing
Housing overview
Metric Value Median home value $219,900 Median rent / month $741 Owner occupied 91.8% Renter occupied 8.2% Vacant 38.7% Single-family detached 91.1% Large apartment buildings 0.3% Mobile homes 7.2% Median rooms 5.6 Avg household size (owned) 2.18
Year built
Era % 2020 or later 0.4% 2010–2019 8.0% 2000–2009 14.6% 1990–1999 11.5% 1980–1989 13.8% 1970–1979 12.3% 1960–1969 12.3% 1950–1959 7.6% 1940–1949 1.7% 1939 or earlier 17.6%
Bedrooms
Size % of units No bedroom (studio) 0.3% 1 bedroom 17.4% 2 bedrooms 28.0% 3 bedrooms 41.9% 4 bedrooms 10.3% 5+ bedrooms 2.2%
Vehicles per household
Vehicles % of households No vehicle 2.1% 1 vehicle 13.3% 2 vehicles 44.7% 3 or more 39.8%
Heating fuel
Fuel type % Electricity 8.2% Propane / LP gas 22.7% Fuel oil 50.6% Wood 16.6%
Households & families
Household type Count % Married-couple family 285 66.7% Cohabiting couple 33 7.7% Male householder, no spouse 65 15.2% Female householder, no spouse 44 10.3% Households with children under 18 66 15.5% Households with seniors (65+) 186 43.6% Average household size 2.21
Marital status
Status Male Female Never married 19.2% 9.7% Married 63.5% 70.5% Separated 0.0% 0.8% Widowed 5.5% 5.9% Divorced 11.7% 13.2%
Education
Some college, no degree
14.0%
Graduate / professional
8.5%
Metric % HS diploma or higher 95.7% Bachelor's or higher 32.3%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 8 6.8% Kindergarten 6 5.1% Elementary school 57 48.7% High school 13 11.1% College / grad school 33 28.2%
Employment
Industry of employment
Education & healthcare
33.2%
Transportation & utilities
7.2%
Arts, food & hospitality
5.4%
Public administration
4.3%
Finance & real estate
3.1%
Agriculture & mining
2.5%
Professional & management
2.1%
Occupation
Category % Management, business & arts 31.3% Service 10.9% Sales & office 17.5% Natural resources & construction 16.9% Production & transportation 23.3%
Employment type
Type % Private sector 77.3% Government 14.8% Self-employed 7.8% Unpaid family workers 0.0%
Commute
Method % Drive alone 67.8% Carpool 14.3% Public transit 0.0% Walk 0.4% Work from home 16.6% Other means 0.9% Avg commute (minutes) 32.1
Poverty
Married-couple families
2.1%
Female-led households
0.0%
Income support
Source % of households Social Security 51.1% Retirement income 33.5% Supplemental Security 1.6% Cash public assistance 0.5% Food stamps / SNAP 5.2%
Health indicators
Condition % Obesity 33.5% High blood pressure 37.8% High cholesterol 37.0% Diabetes 12.2% Heart disease 8.6% Stroke 3.8% Asthma 11.4% Arthritis 32.3% Kidney disease 3.5% Pulmonary disease 10.6% Cancer 7.8%
Behavior / access % Smoking 21.1% Binge drinking 13.1% No physical activity 25.9% Less than 7 hrs sleep 31.9% Depression 22.7% Fair or poor health 15.6% Poor mental health 13.5% Poor physical health 11.6% No health insurance 12.7% Visited doctor (checkup) 81.6% Visited dentist 60.7% Cholesterol screening 91.4% Teeth loss 20.7%
Veterans & disability
Veterans Count % Civilian veterans 128 15.4%
Disability % Any disability 15.7% Under 18 3.6% 18–64 years 13.1% 65 and over 25.4%
Health insurance coverage
Type % Private insurance 75.5% Public insurance 40.5% No insurance 3.7% Uninsured under 19 0.0%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 908 96.3% Spanish 7 0.8% Other Indo-European 0 0.0% Asian & Pacific Islander 7 0.8% Other languages 0 0.0%
Place of birth & citizenship
Origin Count % Native born (US) 932 98.8% Born in same state 923 97.9% Born in different state 557 59.1% Foreign born 9 1.0% Naturalized citizen 11 1.2% Not a US citizen 9 81.8%
Ancestry
Ancestry Count % French 205 21.7% Italian 128 13.6% German 115 12.2% English 38 4%
Ancestry Count % Arab 22 2.3% Polish 3 0.3% Dutch 2 0.2%
Technology access
Metric % of households Computer access 45.3% Internet access 93.7%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 04978
What city is ZIP code 04978 in?
ZIP code 04978 is primarily assigned to Smithfield, Maine.
What county is ZIP code 04978 in?
ZIP code 04978 falls within Somerset County, Maine.
Does ZIP code 04978 have an older population?
30% of residents in ZIP code 04978 are 65 or older, above the national average of ~17%.
Is ZIP code 04978 mostly owner-occupied?
92% of occupied units in ZIP code 04978 are owner-occupied, well above the national average.
Does ZIP code 04978 have a large retiree population?
51% of households in ZIP code 04978 receive Social Security income, suggesting a significant retiree or disability population.
Does ZIP code 04978 have a large veteran population?
15% of civilians in ZIP code 04978 are veterans, above the national average of ~7%.
What timezone is ZIP code 04978 in?
ZIP code 04978 observes the EST timezone.
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