53551 ZIP Code — Lake Mills, WI

Jefferson County, Wisconsin

ZIP code 53551 is located in Lake Mills, Wisconsin, within Jefferson County. It covers approximately 39.55 square miles and serves a population of 9,417 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 920.

About ZIP code 53551

The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $287,200. Owner-occupancy is high at 76%, well above the national average.

Median household income is $83,795. The poverty rate of 6% is below the national average. 32% 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 27 minutes is near the national average.

Educational attainment is near the national average, with 42% of residents holding a bachelor's degree or higher.

Overall, ZIP code 53551 reflects a community defined by high homeownership and a significant Social Security-dependent population.

9,417

population

39.55

sq mi land

Standard

ZIP type

Central (CT)

timezone

53551 ZIP code map

Cities in ZIP code 53551

Below are the cities the US Postal Service accepts for ZIP code 53551. Using any city not on this list may result in mail delivery delays.

City	Status
Lake Mills	Preferred

Nearby ZIP codes

53594 Waterloo (6.1 mi) 53038 Johnson Creek (6.7 mi) 53523 Cambridge (8.7 mi) 53531 Deerfield (8.8 mi) 53549 Jefferson (9.9 mi) 53094 Watertown (10.2 mi) 53094 Watertown (10.2 mi) 53559 Marshall (10.2 mi) 53538 Fort Atkinson (12.2 mi) 53527 Cottage Grove (13.7 mi) 53137 Helenville (13.7 mi) 53579 Reeseville (14.8 mi)

Demographics updated 05/2026

Population
Total population	9,417
Population density	238 / sq mi
State FIPS	55
County FIPS	055

Geography
Land area	39.55 sq mi
Water area	2.42 sq mi
Latitude	43.0844
Longitude	-88.9172
Timezone	Central (CT)
Area code	920

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.7%	37.2%	39.4%
$50k – $100k	38.1%	32.9%	33.0%
$100k – $200k	27.5%	26.4%	22.4%
Over $200k	6.6%	3.6%	5.2%

Demographics & statistics

9,417

Population

238

People per sq mi

40.1

Median age

$83,795

Median household income

$42,769

Per capita income

$287,200

Median home value

$1,074

Median monthly rent

75.5%

Home ownership

6.1%

Poverty rate

0.7%

Unemployment

3,122

Housing units

42.2%

Bachelor's or higher

Age distribution

Male Female

239

Under 5

221

430

5–9

399

373

10–14

346

285

15–19

265

186

20–24

173

636

25–34

590

674

35–44

625

720

45–54

668

237

55–59

220

293

60–64

272

598

65–74

556

177

75–84

165

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	2,306	24.5%
18 and over	7,111	75.5%
65 and over	1,565	16.6%
Median age	40.1 years

Race & ethnicity

White 87.5%

Hispanic or Latino 4.6%

Two or more races 4.4%

Other race 1.3%

American Indian / Alaska Native 1.2%

Black or African American 0.6%

Asian 0.3%

Group	Count	%
White	8,639	87.5%
Hispanic or Latino	455	4.6%
Two or more races	439	4.4%
Other race	132	1.3%
American Indian / Alaska Native	116	1.2%
Black or African American	59	0.6%
Asian	32	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.7%	37.2%	39.4%
$50k – $100k	38.1%	32.9%	33.0%
$100k – $200k	27.5%	26.4%	22.4%
Over $200k	6.6%	3.6%	5.2%

Under $10k 2.4%

$10k–$15k 2.4%

$15k–$25k 3.5%

$25k–$35k 6.6%

$35k–$50k 8.0%

$50k–$75k 19.1%

$75k–$100k 19.4%

$100k–$150k 16.1%

$150k–$200k 14.5%

$200k+ 8.2%

Range	% of households
Under $10k	2.4%
$10k–$15k	2.4%
$15k–$25k	3.5%
$25k–$35k	6.6%
$35k–$50k	8.0%
$50k–$75k	19.1%
$75k–$100k	19.4%
$100k–$150k	16.1%
$150k–$200k	14.5%
$200k+	8.2%
Median income	$83,795

Housing

Home values

Under $50k 6.1%

$50k–$100k 0.2%

$100k–$150k 1.3%

$150k–$200k 9.5%

$200k–$300k 37.1%

$300k–$500k 31.7%

$500k–$1M 10.9%

$1M+ 3.2%

Housing overview

Metric	Value
Median home value	$287,200
Median rent / month	$1,074
Owner occupied	75.5%
Renter occupied	24.5%
Vacant	11.0%
Single-family detached	69.3%
Large apartment buildings	1.8%
Mobile homes	8.4%
Median rooms	6.1
Avg household size (owned)	2.90

Year built

Era	%
2020 or later	1.1%
2010–2019	6.4%
2000–2009	14.5%
1990–1999	18.1%
1980–1989	9.6%
1970–1979	9.1%
1960–1969	8.1%
1950–1959	7.9%
1940–1949	1.4%
1939 or earlier	23.7%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	7.0%
2 bedrooms	24.2%
3 bedrooms	45.5%
4 bedrooms	19.3%
5+ bedrooms	3.6%

Vehicles per household

Vehicles	% of households
No vehicle	4.1%
1 vehicle	30.1%
2 vehicles	38.7%
3 or more	27.0%

Heating fuel

Fuel type	%
Utility gas	75.9%
Electricity	14.7%
Propane / LP gas	6.3%
Fuel oil	0.6%
Wood	1.7%
Solar	0.2%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	2,005	56.4%
Cohabiting couple	226	6.4%
Male householder, no spouse	665	18.7%
Female householder, no spouse	658	18.5%
Households with children under 18	1,083	30.5%
Households with seniors (65+)	1,050	29.5%
Average household size	2.63

Marital status

Status	Male	Female
Never married	28.2%	21.7%
Married	60.1%	58.8%
Separated	0.4%	1.0%
Widowed	1.0%	8.2%
Divorced	10.3%	10.2%

Education

Less than 9th grade 2.3%

Some HS, no diploma 3.4%

HS graduate 22.9%

Some college, no degree 21.2%

Associate's degree 8.1%

Bachelor's degree 26.9%

Graduate / professional 15.3%

Metric	%
HS diploma or higher	94.4%
Bachelor's or higher	42.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	102	4.4%
Kindergarten	207	8.9%
Elementary school	1,208	51.9%
High school	388	16.7%
College / grad school	424	18.2%

Employment

Industry of employment

Education & healthcare 25.5%

Manufacturing 18.0%

Construction 9.4%

Retail trade 9.4%

Finance & real estate 9.1%

Professional & management 8.4%

Arts, food & hospitality 4.1%

Transportation & utilities 3.9%

Other services 3.9%

Public administration 3.5%

Agriculture & mining 2.3%

Wholesale trade 1.6%

Information 0.8%

Occupation

Category	%
Management, business & arts	45.8%
Service	9.6%
Sales & office	17.9%
Natural resources & construction	11.2%
Production & transportation	15.4%

Employment type

Type	%
Private sector	79.7%
Government	15.0%
Self-employed	4.9%
Unpaid family workers	0.4%

Commute

Method	%
Drive alone	81.1%
Carpool	3.1%
Public transit	0.0%
Walk	2.9%
Work from home	12.3%
Other means	0.6%
Avg commute (minutes)	26.7

Poverty

All people 6.1%

Under 18 years 8.8%

18 and over 5.2%

Married-couple families 4.2%

Female-led households 15.3%

Income support

Source	% of households
Social Security	31.5%
Retirement income	25.7%
Supplemental Security	2.7%
Cash public assistance	2.5%
Food stamps / SNAP	6.4%

Health indicators

Condition	%
Obesity	35.1%
High blood pressure	28.6%
High cholesterol	32.1%
Diabetes	8.0%
Heart disease	5.6%
Stroke	2.5%
Asthma	9.4%
Arthritis	23.7%
Kidney disease	2.6%
Pulmonary disease	5.4%
Cancer	7.1%

Behavior / access	%
Smoking	15.7%
Binge drinking	25.6%
No physical activity	18.2%
Less than 7 hrs sleep	30.8%
Depression	20.6%
Fair or poor health	10.3%
Poor mental health	12.7%
Poor physical health	8.7%
No health insurance	9.2%
Visited doctor (checkup)	72.6%
Visited dentist	71.2%
Cholesterol screening	88.4%
Teeth loss	9.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	550	7.7%

Disability	%
Any disability	8.4%
Under 18	5.8%
18–64 years	7.8%
65 and over	14.7%

Health insurance coverage

Type	%
Private insurance	84.9%
Public insurance	26.9%
No insurance	0.9%
Uninsured under 19	0.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	8,957	95.1%
Spanish	65	0.7%
Other Indo-European	63	0.7%
Asian & Pacific Islander	2	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	9,175	97.4%
Born in same state	9,160	97.3%
Born in different state	6,730	71.5%
Foreign born	15	0.2%
Naturalized citizen	242	2.6%
Not a US citizen	90	37.2%

Ancestry

Ancestry	Count	%
Italian	1,278	13.6%
Arab	602	6.4%
French	597	6.3%
Polish	490	5.2%
Irish	84	0.9%

Ancestry	Count	%
Norwegian	79	0.8%
Dutch	58	0.6%
German	51	0.5%
English	51	0.5%

Technology access

Metric	% of households
Computer access	37.7%
Internet access	96.9%

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

Frequently asked questions about ZIP code 53551

What city is ZIP code 53551 in?

ZIP code 53551 is primarily assigned to Lake Mills, Wisconsin.

What county is ZIP code 53551 in?

ZIP code 53551 falls within Jefferson County, Wisconsin.

What is the population of ZIP code 53551?

ZIP code 53551 has an estimated population of 9,417 residents, with a density of 238 people per square mile.

What is the typical home value in ZIP code 53551?

The median home value in ZIP code 53551 is $287,200.

What is the median household income in ZIP code 53551?

The median household income in ZIP code 53551 is $83,795, above the national median of ~$75,000.

What timezone is ZIP code 53551 in?

ZIP code 53551 observes the CST timezone.