| Official Name: | Waterloo, Wisconsin |
| Settlement Type: | City |
| Motto: | Find Your Path Here |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Jefferson |
| Government Type: | Mayor - Council |
| Leader Title: | Mayor |
| Leader Name: | Jennifer Quimby |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 10.02 |
| Area Land Km2: | 9.83 |
| Area Water Km2: | 0.19 |
| Area Total Sq Mi: | 3.87 |
| Area Land Sq Mi: | 3.79 |
| Area Water Sq Mi: | 0.07 |
| Population As Of: | 2020 |
| Population Est: | 3479 |
| Pop Est As Of: | 2021 |
| Population Footnotes: | [2] |
| Population Total: | 3483 |
| Population Density Km2: | 339.17 |
| Population Density Sq Mi: | 878.49 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 810 |
| Coordinates: | 43.1836°N -88.99°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 53594 |
| Area Code: | 920 |
| Blank Name: | FIPS code |
| Blank Info: | 55-83925[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1576289 |
Waterloo is a city in Jefferson County in the U.S. state of Wisconsin. As of the census of 2022, the population was 3,628.The name Waterloo was suggested by Mr. Wilt, a Frenchman living here, who was one of Napoleon's soldiers, at the battle of Waterloo.[4] Waterloo is located in the Watertown-Fort Atkinson micropolitan area which is a sub-market of the larger Milwaukee-Racine-Waukesha CSA.
Waterloo is located at 43.1836°N -88.9897°W, (43.18366, -88.989965)[5] at the intersection of Wisconsin Highway 89 and Wisconsin Highway 19 in northwestern Jefferson County.
According to the United States Census Bureau, the city has a total area of 3.91sqmi, of which, 3.83sqmi is land and 0.08sqmi is water.[6]
As of 2000, the median income for a household in the city was $50,221, and the median income for a family was $56,446. The per capita income for the city was $23,011. About 5.0% of families and 4.8% of the population were below the poverty line, including 5.8% of those under age 18 and 7.1% of those age 65 or over.
As of the census of 2010, there were 3,333 people, 1,331 households, and 867 families residing in the city. The population density was 854.6 people per square mile (330/km2). There were 1,409 housing units at an average density of 361.3 per square mile (139.5/km2). The racial makeup of the city was 89.20% White, 0.80% Black or African American, 0.40% Native American, 0.80% Asian, 9.40% from other races, and 1.20% from two or more races. 12.80% of the population were Hispanic or Latino of any race.
There were 1,331 households, of which 32.8% had children under the age of 18 living with them, 51.4% were married couples living together, 9.2% had a female householder with no husband present, and 34.9% were non-families. 29.2% of all households were made up of individuals, and 23.1% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.09.
In the city, the population was spread out, with 26.1% under the age of 18, 5.6% from 18 to 24, 27.9% from 25 to 44, 26.6% from 45 to 64, and 12.0% who were 65 years of age or older. The median age was 37.5 years. For every 100 females, there were 100 males. For every 100 females age 18 and over, there were 95.7 males.
The city is the headquarters for Trek Bicycle Corporation and Van Holten Pickles.[7] Waterloo was formerly the headquarters of Perry Printing, later Perry-Judd.[8] [9]
Waterloo is the home of its own weekly newspaper named The Courier. Waterloo is a part of the Milwaukee television market with Madison based stations also available over the air and on cable. Waterloo is served by radio stations from the Milwaukee, Madison and Janesville markets.