The town of Washington is made up of a group of small islands that includes Plum Island, Detroit Island, Hog Island, Rock Island, Pilot Island, and the largest, Washington Island. The majority of the population of the town lives on Washington Island and many of the other smaller islands are partly or entirely State Parks or National Wildlife Refuges, with small population, if any. As a result the area is rarely if ever refereed to as the town of Washington or just Washington; more commonly the names of the individual islands are used as a reference.
Most of the people who settled in Washington were Scandinavian immigrants, especially Icelanders. Today, Washington Island is one of the oldest Icelandic communities in the United States and among the largest outside of Iceland itself.
The land area is composed of Plum Island, Detroit Island, Washington Island, Hog Island, Pilot Island, and Rock Island. Washington Island is the largest in a chain of islands extending across Lake Michigan between the Door Peninsula in Wisconsin and the Garden Peninsula in Delta County, Michigan. These islands are outcroppings of the Niagara Escarpment.
There were 293 households out of which 25.3% had children under the age of 18 living with them, 59.0% were married couples living together, 6.1% had a female householder with no husband present, and 32.1% were non-families. 30.4% of all households were made up of individuals and 17.1% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.79.
The age distribution was 24.1% under the age of 18, 3.0% from 18 to 24, 17.4% from 25 to 44, 33.9% from 45 to 64, and 21.5% who were 65 years of age or older. The median age was 49 years. For every 100 females there were 93.5 males. For every 100 females age 18 and over, there were 90.5 males.
The median income for a household in the town was $31,146, and the median income for a family was $45,481. Males had a median income of $30,000 versus $22,500 for females. The per capita income for the town was $17,065. About 4.7% of families and 10.5% of the population were below the poverty line, including 16.3% of those under age 18 and 8.8% of those age 65 or over.