2020 census As of the
2020 census, Sidney had a population of 1,208. The median age was 38.2 years. 25.0% of residents were under the age of 18 and 15.9% of residents were 65 years of age or older. For every 100 females there were 99.3 males, and for every 100 females age 18 and over there were 99.6 males age 18 and over. There were 354 families residing in the village, and the population density was . 0.0% of residents lived in urban areas, while 100.0% lived in rural areas. There were 489 households in Sidney, of which 33.5% had children under the age of 18 living in them. Of all households, 53.4% were married-couple households, 15.5% were households with a male householder and no spouse or partner present, and 21.1% were households with a female householder and no spouse or partner present. About 23.9% of all households were made up of individuals and 10.1% had someone living alone who was 65 years of age or older. There were 517 housing units at an average density of , of which 5.4% were vacant. The homeowner vacancy rate was 2.3% and the rental vacancy rate was 2.8%.
Income and poverty The median income for a household in the village was $76,250, and the median income for a family was $81,071. Males had a median income of $56,750 versus $43,333 for females. The
per capita income for the village was $34,866. About 2.0% of families and 3.3% of the population were below the
poverty line, including 3.6% of those under age 18 and none of those age 65 or over. ==Government==