| Official Name: | Windsor, Illinois |
| Settlement Type: | City |
| Mapsize: | 250x161px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Shelby |
| Subdivision Type3: | Township |
| Leader Title: | Mayor |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.63 |
| Area Land Km2: | 1.63 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.63 |
| Area Land Sq Mi: | 0.63 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 1079 |
| Population Density Km2: | 661.23 |
| Population Density Sq Mi: | 1712.70 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 705 |
| Coordinates: | 39.4389°N -88.5953°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 61957 |
| Area Code: | 217 |
| Blank Name: | FIPS code |
| Blank Info: | 17-82322 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2397341 |
Windsor is a city in Shelby County, Illinois, United States. The population was 1,079 at the 2020 census.
According to the US Census Bureau, the city has a total area of, all land.[2]
As of the census[3] of 2000, there were 1,125 people, 466 households, and 317 families residing in the city. The population density was 1820.3sp=usNaNsp=us. There were 523 housing units at an average density of 846.2sp=usNaNsp=us. The racial makeup of the city was 98.84% White, 0.36% from other races, and 0.80% from two or more races. Hispanic or Latino of any race were 0.44% of the population.
There were 466 households, out of which 32.0% had children under the age of 18 living with them, 54.7% were married couples living together, 10.3% had a female householder with no husband present, and 31.8% were non-families. 27.9% of all households were made up of individuals, and 15.0% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.93.
In the city, the population was spread out, with 26.2% under the age of 18, 8.5% from 18 to 24, 26.7% from 25 to 44, 21.4% from 45 to 64, and 17.2% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 88.4 males. For every 100 females age 18 and over, there were 85.7 males.
The median income for a household in the city was $33,095, and the median income for a family was $40,250. Males had a median income of $27,100 versus $20,000 for females. The per capita income for the city was $16,002. About 6.5% of families and 8.4% of the population were below the poverty line, including 11.5% of those under age 18 and 9.9% of those age 65 or over.