Erin is a town in Washington County, Wisconsin, home to about 3,818 people across 36 square miles. It has no ZIP code of its own: it’s part of 53017, 53027 and 53033.
Homes sold for a median of $222 per square foot across 3 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Richfield; part is in Erin
Mostly Hartford City (Washington County); part is in Erin
Mostly Richfield; part is in Erin
Each card is that ZIP code’s whole market, including any part outside Erin. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Erin’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)33 miles away |
|---|---|
| Nearest city of 250,000+ | Milwaukee, WI25 miles away |
| Nearest city of 1 million+ | Chicago, IL107 miles away |
Straight-line distances from the center of Erin; 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.
Erin had 3,825 residents in the 2020 census, up 4% since 2000.
It’s the 238th largest of 1,889 towns in Wisconsin by population.
Washington County grew from 23,589 residents in 1900 to 136,761 in 2020.
Washington County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 80°F in summer, and winter lows average 8°F. About 35.6 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Slinger Wwtp, WI weather station (3 miles away).
54,404 jobs at 3,427 businesses in Washington County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
204 doctors and other health care providers list an office in Erin’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 37 |
|---|---|
| Specialist doctors | 39 |
| Dentists | 17 |
| Nurse practitioners and physician assistants | 46 |
| Mental health providers | 14 |
| Physical and occupational therapists | 35 |
| Optometrists | 5 |
| Chiropractors | 11 |
| Pharmacies | 6 |
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 (22 nearby)
Grocery stores (3 nearby)
Pharmacies (1 nearby)
Libraries (4 nearby)
Museums (2 nearby)
Theaters and performance venues (3 nearby)
Counts are within about 4 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 Slinger School District, Germantown School District, Erin School District and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Addison ElementaryHartford | Pre-K–5 | 441 | Public | 5.8 mi |
| Amy Belle ElementaryColgate | Pre-K–5 | 356 | Public | 9.8 mi |
| Erin ElementaryHartford | Pre-K–8 | 399 | Public | 3.8 mi |
| Friess Lake ElementaryHubertus | Pre-K–4 | 279 | Public | 5.5 mi |
| Lincoln ElementaryHartford | Pre-K–5 | 460 | Public | 1.7 mi |
| Rossman ElementaryHartford | Pre-K–5 | 422 | Public | 2.0 mi |
| Central MiddleHartford | 6–8 | 419 | Public | 1.7 mi |
| Hartford HighHartford | 9–12 | 1,324 | Public | 2.0 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Crown of Life Lutheran SchoolHubertus | Pre-K–8 | 88 | Wisconsin Evangelical Lutheran Synod | 6.8 mi |
| Peace Lutheran SchoolHartford | Pre-K–8 | 247 | Wisconsin Evangelical Lutheran Synod | 2.6 mi |
| St Augustine SchoolColgate | Pre-K–12 | 66 | Roman Catholic | 7.2 mi |
| St Gabriel Catholic ParishHubertus | Pre-K–8 | 120 | Roman Catholic | 6.6 mi |
| St Kilian SchoolHartford | Pre-K–8 | 46 | Roman Catholic | 2.3 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 Hartford City (Washington County), Richfield, Hartford Town, Lisbon, Addison, Germantown and Herman Town (Dodge County).
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.