Niagara is a city in Marinette County, Wisconsin, United States.

[4] The city lies to the north of and adjacent to the Town of Niagara.

The city of Niagara was founded in 1900 on the banks of the Menominee River.

There were 797 housing units at an average density of 289.8 per square mile (111.9/km2).

30.4% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older.

There were 812 housing units at an average density of 296.3 per square mile (114.4/km2).

31.1% of all households were made up of individuals, and 16.7% had someone living alone who was 65 years of age or older.