48178 ZIP Code — South Lyon, MI

Oakland County, Michigan

ZIP code 48178 is located in South Lyon, Michigan, within Oakland County. It covers approximately 47.96 square miles and serves a population of 36,842 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 248.

About ZIP code 48178

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $362,900. Owner-occupancy is high at 92%, well above the national average.

The gap between median ($127,052) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% is below the national average. 31% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 32 minutes is near the national average.

Educational attainment is high — 51% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 48178 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

36,842

population

47.96

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

48178 ZIP code map

Cities in ZIP code 48178

Below are the cities the US Postal Service accepts for ZIP code 48178. Using any city not on this list may result in mail delivery delays.

City	Status
South Lyon	Preferred

Nearby ZIP codes

48165 New Hudson (4.5 mi) 48168 Northville (6.2 mi) 48167 Northville (6.7 mi) 48374 Novi (7 mi) 48189 Whitmore Lake (7.4 mi) 48116 Brighton (7.5 mi) 48170 Plymouth (7.8 mi) 48393 Wixom (7.9 mi) 48105 Ann Arbor (8.2 mi) 48381 Milford (8.9 mi) 48380 Milford (9.8 mi) 48375 Novi (9.9 mi)

Demographics updated 05/2026

Population
Total population	36,842
Population density	768 / sq mi
State FIPS	26
County FIPS	125

Geography
Land area	47.96 sq mi
Water area	1.74 sq mi
Latitude	42.4351
Longitude	-83.6544
Timezone	Eastern (ET)
Area code	248

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.2%	30.7%	42.6%
$50k – $100k	24.2%	28.7%	31.1%
$100k – $200k	35.5%	28.4%	20.6%
Over $200k	19.0%	12.3%	5.7%

Demographics & statistics

36,842

Population

768

People per sq mi

43.4

Median age

$127,052

Median household income

$58,927

Per capita income

$362,900

Median home value

$1,169

Median monthly rent

91.9%

Home ownership

3.4%

Poverty rate

3.4%

Unemployment

12,919

Housing units

51.4%

Bachelor's or higher

Age distribution

Male Female

934

Under 5

927

1,174

5–9

1,166

1,369

10–14

1,360

1,364

15–19

1,354

963

20–24

957

1,586

25–34

1,575

2,271

35–44

2,256

2,970

45–54

2,949

1,502

55–59

1,492

1,329

60–64

1,320

2,004

65–74

1,991

698

75–84

693

320

85+

318

← Male

Female →

Age summary

Group	Count	%
Under 18	8,615	23.4%
18 and over	28,227	76.6%
65 and over	6,024	16.4%
Median age	43.4 years

Race & ethnicity

White 91.4%

Two or more races 3.1%

Asian 2.5%

Hispanic or Latino 1.5%

Other race 0.7%

Black or African American 0.7%

Group	Count	%
White	34,177	91.4%
Two or more races	1,174	3.1%
Asian	930	2.5%
Hispanic or Latino	564	1.5%
Other race	277	0.7%
Black or African American	271	0.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.2%	30.7%	42.6%
$50k – $100k	24.2%	28.7%	31.1%
$100k – $200k	35.5%	28.4%	20.6%
Over $200k	19.0%	12.3%	5.7%

Under $10k 2.6%

$10k–$15k 1.4%

$15k–$25k 2.5%

$25k–$35k 3.0%

$35k–$50k 6.9%

$50k–$75k 12.3%

$75k–$100k 11.8%

$100k–$150k 16.4%

$150k–$200k 15.0%

$200k+ 28.0%

Range	% of households
Under $10k	2.6%
$10k–$15k	1.4%
$15k–$25k	2.5%
$25k–$35k	3.0%
$35k–$50k	6.9%
$50k–$75k	12.3%
$75k–$100k	11.8%
$100k–$150k	16.4%
$150k–$200k	15.0%
$200k+	28.0%
Median income	$127,052

Housing

Home values

Under $50k 3.5%

$50k–$100k 5.4%

$100k–$150k 6.2%

$150k–$200k 6.1%

$200k–$300k 17.0%

$300k–$500k 38.3%

$500k–$1M 22.0%

$1M+ 1.4%

Housing overview

Metric	Value
Median home value	$362,900
Median rent / month	$1,169
Owner occupied	91.9%
Renter occupied	8.1%
Vacant	2.9%
Single-family detached	75.9%
Large apartment buildings	1.0%
Mobile homes	3.7%
Median rooms	7.1
Avg household size (owned)	2.77

Year built

Era	%
2020 or later	0.8%
2010–2019	16.0%
2000–2009	19.2%
1990–1999	25.7%
1980–1989	9.6%
1970–1979	12.9%
1960–1969	6.9%
1950–1959	4.6%
1940–1949	1.2%
1939 or earlier	3.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.3%
1 bedroom	5.1%
2 bedrooms	17.3%
3 bedrooms	39.9%
4 bedrooms	31.9%
5+ bedrooms	5.5%

Vehicles per household

Vehicles	% of households
No vehicle	2.5%
1 vehicle	22.2%
2 vehicles	46.1%
3 or more	29.1%

Heating fuel

Fuel type	%
Utility gas	86.8%
Electricity	8.3%
Propane / LP gas	2.3%
Fuel oil	0.6%
Wood	0.6%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	9,296	68.3%
Cohabiting couple	495	3.6%
Male householder, no spouse	1,546	11.4%
Female householder, no spouse	2,282	16.8%
Households with children under 18	4,573	33.6%
Households with seniors (65+)	4,029	29.6%
Average household size	2.70

Marital status

Status	Male	Female
Never married	25.2%	22.9%
Married	65.4%	62.1%
Separated	0.5%	0.2%
Widowed	2.4%	6.6%
Divorced	6.5%	8.2%

Education

Less than 9th grade 0.6%

Some HS, no diploma 1.5%

HS graduate 17.5%

Some college, no degree 21.0%

Associate's degree 8.1%

Bachelor's degree 30.1%

Graduate / professional 21.2%

Metric	%
HS diploma or higher	97.9%
Bachelor's or higher	51.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	677	7.1%
Kindergarten	524	5.5%
Elementary school	4,042	42.1%
High school	2,295	23.9%
College / grad school	2,062	21.5%

Employment

Industry of employment

Manufacturing 22.6%

Education & healthcare 20.9%

Professional & management 11.5%

Retail trade 7.5%

Finance & real estate 7.3%

Arts, food & hospitality 7.3%

Construction 6.6%

Other services 4.3%

Transportation & utilities 3.9%

Public administration 3.5%

Wholesale trade 2.7%

Information 1.4%

Agriculture & mining 0.5%

Occupation

Category	%
Management, business & arts	54.4%
Service	11.2%
Sales & office	20.7%
Natural resources & construction	5.7%
Production & transportation	7.9%

Employment type

Type	%
Private sector	85.9%
Government	9.6%
Self-employed	4.3%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	79.0%
Carpool	5.2%
Public transit	0.1%
Walk	0.5%
Work from home	14.0%
Other means	1.2%
Avg commute (minutes)	31.5

Poverty

All people 3.4%

Under 18 years 1.6%

18 and over 4.0%

Married-couple families 1.1%

Female-led households 8.2%

Income support

Source	% of households
Social Security	30.6%
Retirement income	26.9%
Supplemental Security	3.2%
Cash public assistance	0.8%
Food stamps / SNAP	2.6%

Health indicators

Condition	%
Obesity	32.4%
High blood pressure	29.7%
High cholesterol	33.0%
Diabetes	8.6%
Heart disease	5.4%
Stroke	2.4%
Asthma	10.2%
Arthritis	25.9%
Kidney disease	2.5%
Pulmonary disease	5.8%
Cancer	7.0%

Behavior / access	%
Smoking	14.6%
Binge drinking	19.1%
No physical activity	16.3%
Less than 7 hrs sleep	31.7%
Depression	19.6%
Fair or poor health	10.6%
Poor mental health	14.4%
Poor physical health	8.6%
No health insurance	7.1%
Visited doctor (checkup)	73.3%
Visited dentist	76.3%
Cholesterol screening	93.4%
Teeth loss	8.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,301	4.6%

Disability	%
Any disability	9.3%
Under 18	2.7%
18–64 years	7.4%
65 and over	25.8%

Health insurance coverage

Type	%
Private insurance	90.4%
Public insurance	23.0%
No insurance	1.9%
Uninsured under 19	1.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	34,981	94.9%
Spanish	642	1.8%
Other Indo-European	120	0.3%
Asian & Pacific Islander	274	0.8%
Other languages	248	0.7%

Place of birth & citizenship

Origin	Count	%
Native born (US)	34,737	94.3%
Born in same state	34,522	93.7%
Born in different state	29,314	79.6%
Foreign born	215	0.6%
Naturalized citizen	2,105	5.7%
Not a US citizen	1,040	49.4%

Ancestry

Ancestry	Count	%
French	5,642	15.3%
Italian	4,873	13.2%
Arab	1,410	3.8%
German	629	1.7%
Irish	627	1.7%

Ancestry	Count	%
English	608	1.7%
Polish	282	0.8%
Norwegian	191	0.5%
Dutch	64	0.2%

Technology access

Metric	% of households
Computer access	37.0%
Internet access	98.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 48178

What city is ZIP code 48178 in?

ZIP code 48178 is primarily assigned to South Lyon, Michigan.

What county is ZIP code 48178 in?

ZIP code 48178 falls within Oakland County, Michigan.

Is ZIP code 48178 mostly owner-occupied?

92% of occupied units in ZIP code 48178 are owner-occupied, well above the national average.

How educated is the population of ZIP code 48178?

51% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 48178?

The median household income in ZIP code 48178 is $127,052, above the national median of ~$75,000.

What is the typical home value in ZIP code 48178?

The median home value in ZIP code 48178 is $362,900.

What timezone is ZIP code 48178 in?

ZIP code 48178 observes the EST timezone.