Lake Mills City is a city in Jefferson County, Wisconsin, home to about 6,470 people across 4.2 square miles. Its ZIP code is 53551.
Homes sold for a median of $229 per square foot in the three months ending August 2026, a seller’s market.
Mostly Lake Mills City; also Lake Mills Town and Aztalan
Each card is that ZIP code’s whole market, including any part outside Lake Mills City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Lake Mills City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | General Mitchell International Airport (MKE)52 miles away |
|---|---|
| Closer regional airport | Dane County Regional Truax Field (MSN)22 miles away |
| Nearest city of 250,000+ | Madison, WI26 miles away |
| Nearest city of 1 million+ | Chicago, IL106 miles away |
Straight-line distances from the center of Lake Mills City; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Lake Mills City had 6,211 residents in the 2020 census, up 28% since 2000.
It’s the 155th largest of 1,889 towns in Wisconsin by population.
Jefferson County grew from 34,789 residents in 1900 to 84,900 in 2020.
Jefferson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 11°F. About 37 inches of rain and melted snow fall in a typical year, with about 42 inches of snow.
Source: NOAA 1991–2020 climate normals, Lake Mills Wwtp, WI weather station (about a mile away).
31,584 jobs at 2,058 businesses in Jefferson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
50 doctors and other health care providers list an office in Lake Mills City.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Specialist doctors | 2 |
| Dentists | 5 |
| Nurse practitioners and physician assistants | 8 |
| Mental health providers | 5 |
| Physical and occupational therapists | 20 |
| Optometrists | 1 |
| Chiropractors | 3 |
| Pharmacies | 4 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (6 nearby)
Grocery stores (1 nearby)
Libraries (1 nearby)
Museums
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Lake Mills Area School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Lake Mills ElementaryLake Mills | Pre-K–4 | 613 | Public | 0.5 mi |
| Lake Mills MiddleLake Mills | 5–8 | 413 | Public | 0.1 mi |
| Lake Mills HighLake Mills | 9–12 | 447 | Public | 0.8 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| St Paul Evangelical Lutheran SchoolLake Mills | Pre-K–8 | 203 | Wisconsin Evangelical Lutheran Synod | 1.5 mi |
| Lakeside Lutheran High SchoolLake Mills | 9–12 | 535 | Wisconsin Evangelical Lutheran Synod | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Lake Mills Town, Aztalan, Waterloo Town (Jefferson County) and Milford.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.