| Official Name: | Mayfield Township |
| Settlement Type: | Township |
| Unit Pref: | Imperial |
| Image Map1: | Dekalb County Illinois.png |
| Mapsize1: | 150px |
| Map Caption1: | DeKalb County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | DeKalb |
| Established Title: | Established |
| Established Date: | November 20, 1850 |
| Area Total Sq Mi: | 35.15 |
| Area Land Sq Mi: | 34.93 |
| Area Water Sq Mi: | 0.22 |
| Area Water Percent: | 0.63 |
| Population As Of: | 2020 |
| Population Total: | 872 |
| Population Density Sq Mi: | auto |
| Elevation M: | 264 |
| Elevation Ft: | 866 |
| Coordinates: | 42.0197°N -88.7731°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 60111, 60115, 60145, 60146, 60178 |
| Blank Name: | FIPS code |
| Blank Info: | 17-037-47696 |
Mayfield Township is one of nineteen townships in DeKalb County, Illinois, USA. As of the 2020 census, its population was 872 and it contained 409 housing units.[1] Mayfield Township was renamed from Liberty Township on November 20, 1850.
According to the 2021 census gazetteer files, Mayfield Township has a total area of 35.15sqmi, of which 34.93sqmi (or 99.37%) is land and 0.22sqmi (or 0.63%) is water.[2]
As of the 2020 census there were 872 people, 309 households, and 116 families residing in the township. The population density was 24.81PD/sqmi. There were 409 housing units at an average density of 11.64/sqmi. The racial makeup of the township was 86.47% White, 1.03% African American, 0.69% Native American, 1.26% Asian, 0.00% Pacific Islander, 3.10% from other races, and 7.45% from two or more races. Hispanic or Latino of any race were 8.26% of the population.
There were 309 households, out of which 6.80% had children under the age of 18 living with them, 34.63% were married couples living together, none had a female householder with no spouse present, and 62.46% were non-families. 34.60% of all households were made up of individuals, and 16.50% had someone living alone who was 65 years of age or older. The average household size was 2.08 and the average family size was 2.59.
The township's age distribution consisted of 8.7% under the age of 18, none from 18 to 24, 52.9% from 25 to 44, 14% from 45 to 64, and 24.4% who were 65 years of age or older. The median age was 34.7 years. For every 100 females, there were 151.6 males. For every 100 females age 18 and over, there were 164.9 males.
The median income for a household in the township was $85,081. Males had a median income of $31,667 versus $37,031 for females. The per capita income for the township was $33,298. No families and 4.3% of the population were below the poverty line, including none of those under age 18 and 10.2% of those age 65 or over.