Nelson is a village in Lee County, Illinois, United States. The population was 170 at the 2010 census, up from 163 in 2000.
Nelson is located at 41°47′47″N 89°36′17″W / 41.79639°N 89.60472°W / 41.79639; -89.60472 (41.796494, -89.604646).
According to the 2010 census, Nelson has a total area of 0.244 square miles (0.63 km), of which 0.24 square miles (0.62 km) (or 98.36%) is land and 0.004 square miles (0.01 km) (or 1.64%) is water.
As of the census of 2000, there were 163 people, 64 households, and 49 families residing in the village. The population density was 719.0 people per square mile (273.6/km²). There were 70 housing units at an average density of 308.8 per square mile (117.5/km²). The racial makeup of the village was 96.32% White, 0.61% African American, 0.61% Native American, and 2.45% from two or more races. Hispanic or Latino of any race were 6.13% of the population.
There were 64 households out of which 31.3% had children under the age of 18 living with them, 60.9% were married couples living together, 9.4% had a female householder with no husband present, and 21.9% were non-families. 17.2% of all households were made up of individuals and 14.1% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 2.90.
In the village, the age distribution of the population shows 24.5% under the age of 18, 6.7% from 18 to 24, 27.6% from 25 to 44, 22.7% from 45 to 64, and 18.4% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 111.7 males. For every 100 females age 18 and over, there were 101.6 males.
The median income for a household in the village was $35,833, and the median income for a family was $37,500. Males had a median income of $33,125 versus $21,250 for females. The per capita income for the village was $15,043. About 15.9% of families and 30.0% of the population were below the poverty line, including 60.0% of those under the age of eighteen and 9.1% of those sixty five or over.