| Official Name: | South Willard, Utah |
| Settlement Type: | CDP |
| Image Map1: | Map of USA UT.svg |
| Map Caption1: | Location of Utah in the United States |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Utah |
| Subdivision Type2: | County |
| Subdivision Name2: | Box Elder |
| Named For: | Willard Richards |
| Unit Pref: | Imperial |
| Area Total Km2: | 15.1 |
| Area Land Km2: | 15.1 |
| Area Water Km2: | 0.0 |
| Area Total Sq Mi: | 5.8 |
| Area Land Sq Mi: | 5.8 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2010 |
| Population Total: | 1571 |
| Population Density Km2: | 38.9 |
| Population Density Sq Mi: | 100.6 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation M: | 1320 |
| Elevation Ft: | 4331 |
| Coordinates: | 41.3544°N -112.0406°W |
| Blank Name: | FIPS code |
| Blank Info: | 49-71255[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1852446 |
South Willard is a census-designated place (CDP) in Box Elder County, Utah, United States. The population was 1,571 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 5.8 square miles (15.1 km2), all land.
As of the census of 2000, there were 586 people, 209 households, and 156 families residing in the CDP. The population density was 100.6 people per square mile (38.9/km2). There were 228 housing units at an average density of 39.2/sq mi (15.1/km2). The racial makeup of the CDP was 95.22% White, 1.19% Native American, 0.17% Asian, 1.87% from other races, and 1.54% from two or more races. Hispanic or Latino of any race were 5.12% of the population.
There were 209 households, out of which 39.2% had children under the age of 18 living with them, 66.5% were married couples living together, 6.7% had a female householder with no husband present, and 24.9% were non-families. 23.0% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.34.
In the CDP, the population was spread out, with 29.0% under the age of 18, 12.3% from 18 to 24, 29.4% from 25 to 44, 17.4% from 45 to 64, and 11.9% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 104.2 males. For every 100 females age 18 and over, there were 104.9 males.
The median income for a household in the CDP was $43,214, and the median income for a family was $45,000. Males had a median income of $36,607 versus $20,938 for females. The per capita income for the CDP was $16,560. About 9.5% of families and 7.4% of the population were below the poverty line, including 8.2% of those under age 18 and 3.1% of those age 65 or over.