| Official Name: | Blair Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Clay County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Clay County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Clay |
| Established Title: | Established |
| Established Date: | November 5, 1861 |
| Area Total Sq Mi: | 36.22 |
| Area Land Sq Mi: | 36.22 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2020 |
| Population Total: | 573 |
| Population Density Sq Mi: | auto |
| Elevation M: | 157 |
| Elevation Ft: | 515 |
| Coordinates: | 38.8667°N -120°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 62426, 62443, 62858 |
| Blank Name: | FIPS code |
| Blank Info: | 17-025-06392 |
| Unit Pref: | Imperial |
Blair Township is one of twelve townships in Clay County, Illinois, USA. As of the 2020 census, its population was 573 and it contained 267 housing units.[1]
According to the 2010 census, the township (T5N R6E) has a total area of, all land.[2]
(This list is based on USGS data and may include former settlements.)
The township contains these eight cemeteries: Bethel, Conley, Connelly Family, Kincaid, Mascgher (Mascher) Family, Newton Chapel, Old Union and Ooten.
As of the 2020 census there were 573 people, 279 households, and 228 families residing in the township. The population density was 15.83PD/sqmi. There were 267 housing units at an average density of 7.38/sqmi. The racial makeup of the township was 95.81% White, 0.17% African American, 0.00% Native American, 0.17% Asian, 0.00% Pacific Islander, 0.17% from other races, and 3.66% from two or more races. Hispanic or Latino of any race were 0.35% of the population.
There were 279 households, out of which 25.80% had children under the age of 18 living with them, 64.52% were married couples living together, 14.34% had a female householder with no spouse present, and 18.28% were non-families. 18.30% of all households were made up of individuals, and 10.80% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.54.
The township's age distribution consisted of 23.6% under the age of 18, 0.6% from 18 to 24, 12.1% from 25 to 44, 29.7% from 45 to 64, and 34.1% who were 65 years of age or older. The median age was 50.8 years. For every 100 females, there were 100.9 males. For every 100 females age 18 and over, there were 111.5 males.
The median income for a household in the township was $51,989, and the median income for a family was $51,742. Males had a median income of $48,839 versus $36,713 for females. The per capita income for the township was $26,564. About 11.8% of families and 17.6% of the population were below the poverty line, including 50.9% of those under age 18 and 2.3% of those age 65 or over.