| Official Name: | Mason Township |
| Settlement Type: | Township |
| Image Map1: | Map of Illinois highlighting Effingham County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Effingham County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Effingham |
| Established Title: | Established |
| Established Date: | November 6, 1860 |
| Area Total Sq Mi: | 37.22 |
| Area Land Sq Mi: | 37.18 |
| Area Water Sq Mi: | 0.04 |
| Area Water Percent: | 0.11 |
| Population As Of: | 2020 |
| Population Total: | 1275 |
| Population Density Sq Mi: | auto |
| Elevation M: | 174 |
| Elevation Ft: | 571 |
| Coordinates: | 38.9667°N -126°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 62411, 62426, 62443, 62473 |
| Blank Name: | FIPS code |
| Blank Info: | 17-049-47462 |
| Unit Pref: | Imperial |
Mason Township is one of fifteen townships in Effingham County, Illinois, USA. As of the 2020 census, its population was 1,275 and it contained 582 housing units.[1]
According to the 2010 census, the township (T6N R5E) has a total area of, of which (or 99.89%) is land and (or 0.11%) is water.[2]
The township contains these thirteen cemeteries: Bailey, Brockett, Brown, Davidson, Edgewood, Leith, Mason, New Hope, Old Mason, Robinson, Saint Ann's Catholic, Wabash and Wright.
As of the 2020 census there were 1,275 people, 568 households, and 407 families residing in the township. The population density was 34.29PD/sqmi. There were 582 housing units at an average density of 15.65/sqmi. The racial makeup of the township was 93.25% White, 0.55% African American, 0.31% Native American, 0.47% Asian, 0.00% Pacific Islander, 1.18% from other races, and 4.24% from two or more races. Hispanic or Latino of any race were 1.41% of the population.
There were 568 households, out of which 29.90% had children under the age of 18 living with them, 58.98% were married couples living together, 4.75% had a female householder with no spouse present, and 28.35% were non-families. 16.00% of all households were made up of individuals, and 7.70% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.68.
The township's age distribution consisted of 18.2% under the age of 18, 14.4% from 18 to 24, 19.8% from 25 to 44, 30.5% from 45 to 64, and 17.1% who were 65 years of age or older. The median age was 41.0 years. For every 100 females, there were 115.3 males. For every 100 females age 18 and over, there were 114.4 males.
The median income for a household in the township was $45,313, and the median income for a family was $48,125. Males had a median income of $36,196 versus $25,833 for females. The per capita income for the township was $22,582. About 7.1% of families and 10.3% of the population were below the poverty line, including 21.2% of those under age 18 and 10.3% of those age 65 or over.