|— Village —|
|• Total||0.65 sq mi (1.68 km2)|
|• Land||0.65 sq mi (1.68 km2)|
|• Water||0 sq mi (0 km2)|
|Elevation||1,129 ft (344 m)|
|• Estimate (2012)||864|
|• Density||1,304.6/sq mi (503.7/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||0834501|
Waterloo is located at .(41.287021, -96.288387)
2010 census 
As of the census of 2010, there were 848 people, 337 households, and 229 families residing in the village. The population density was 1,304.6 inhabitants per square mile (503.7 /km2). There were 359 housing units at an average density of 552.3 per square mile (213.2 /km2). The racial makeup of the village was 95.9% White, 0.6% African American, 1.2% Native American, 1.1% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 6.5% of the population.
There were 337 households of which 30.6% had children under the age of 18 living with them, 57.0% were married couples living together, 8.0% had a female householder with no husband present, 3.0% had a male householder with no wife present, and 32.0% were non-families. 27.0% of all households were made up of individuals and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.09.
The median age in the village was 38.9 years. 26.7% of residents were under the age of 18; 6.9% were between the ages of 18 and 24; 25.8% were from 25 to 44; 28.1% were from 45 to 64; and 12.5% were 65 years of age or older. The gender makeup of the village was 49.8% male and 50.2% female.
2000 census 
As of the census of 2000, there were 459 people, 183 households, and 124 families residing in the village. The population density was 1,292.7 people per square mile (492.3/km²). There were 190 housing units at an average density of 535.1 per square mile (203.8/km²). The racial makeup of the village was 98.69% White, 0.87% from other races, and 0.44% from two or more races. Hispanic or Latino of any race were 2.61% of the population.
There were 183 households out of which 30.6% had children under the age of 18 living with them, 60.7% were married couples living together, 4.4% had a female householder with no husband present, and 31.7% were non-families. 27.9% of all households were made up of individuals and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.12.
In the village the population was spread out with 28.1% under the age of 18, 6.1% from 18 to 24, 26.6% from 25 to 44, 26.1% from 45 to 64, and 13.1% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 100.4 males. For every 100 females age 18 and over, there were 98.8 males.
As of 2000 the median income for a household in the village was $45,625, and the median income for a family was $55,156. Males had a median income of $36,875 versus $21,827 for females. The per capita income for the village was $19,089. None of the families and 1.4% of the population were living below the poverty line, including no under eighteens and 2.3% of those over 64.
The Village of Waterloo, on the Elkhorn and Platte Rivers, was founded by two men: John Logan, who came in 1863 right after his discharge from the Second Nebraska Volunteer Cavalry, and Elias Kelsey, who arrived in 1867. Logan established a post office in 1864, and a school in 1865. Designated a station on the Union Pacific Railroad in 1870, the town's future was assured. Named "Waterloo" [presumably for a battlefield in Belgium], an attempt to incorporate in 1871 failed, as did a second attempt. The third petition in 1883 was successful, by which time an addition had already been made.
History notes "a spectacular train wreck" near Waterloo in 1873, when a $30,000 cargo of fish bound for California fell into the Elkhorn River just east of the town.
For many years Waterloo was the world's largest producer of vine and seed corn. Coy & Sons, started in 1879, became Cornhusker Seed in the 1950s. Other companies were: Emerson Seed, Omaha Elevator, Hively Seed, Hopper Grain, Waldron Seed, Western Seed & Irrigation, Waterloo Elevator and Stimmel Seed. The J.C.Robinson Seed Company was established in 1888 and is still owned and managed by the family. It became the biggest, most prominent, and is the only one at this location today. The largest single vine seed sale occurred in the 1920s when eight railcar-loads of cucumber seeds were shipped.
Several shootings in the 1880s, and a promotional fight between a bulldog and bobcat in 1889, brought notoriety to the town. As a recreation area, Waterloo had a small excursion boat called "The Swastika," owned by H.A.Simmons. A humorous note in the history is a 1910 ordinance prohibiting barbers from eating onions.
In 1903 the Waterloo Women's Club started our library. Carrie Nation, the Kansas saloon smasher, visited Waterloo in 1908. In 1920 it was reported that 26 women voted.
Governor Franklin D. Roosevelt visited the Sumnick family farm south of Waterloo in 1932. They visited him in Washington when he became president.
A viaduct built over the Union Pacific mainline near Waterloo in 1936 was often called "Cochran Alps," because of the efforts by Governor Robert L.Cochran to have it constructed. It was replaced by a new one in 1986.
Because of its location on two very unpredictable rivers, Waterloo has been ravaged by many floods. A bond issue in 1965 resulted in a levee to help protect the town. Waterloo has a fire and rescue department. Chief John Love, after 36 years of service, retired in 1987.
The current population of Waterloo is about 450.
Notable people 
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2012-06-24.
- "American FactFinder". United States Census Bureau. Retrieved 2012-06-24.
- "Population Estimates". United States Census Bureau. Retrieved 2013-05-29.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- History of Waterloo University of Nebraska