| Official Name: | Monarch Mill, South Carolina |
| Settlement Type: | CDP |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Carolina |
| Subdivision Type2: | County |
| Subdivision Name2: | Union |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 14.54 |
| Area Land Km2: | 14.54 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 5.61 |
| Area Land Sq Mi: | 5.61 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 1584 |
| Population Density Km2: | 108.98 |
| Population Density Sq Mi: | 282.25 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 482 |
| Coordinates: | 34.715°N -81.5925°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 29379[3] |
| Area Code: | 864 |
| Blank Name: | FIPS code |
| Blank Info: | 45-47200[4] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2403300 |
Monarch Mill is a census-designated place (CDP) in Union County, South Carolina, United States. The population was 1,811 at the 2010 census.
Monarch Mill is located at 34.715°N -81.5925°W.[5]
According to the United States Census Bureau, the CDP has a total area of 5.6sqmi, all land.
As of the census of 2000, there were 1,930 people, 796 households, and 580 families residing in the CDP. The population density was 343.1sp=usNaNsp=us. There were 862 housing units at an average density of 153.3sp=usNaNsp=us. The racial makeup of the CDP was 84.61% White, 14.77% African American, 0.16% Native American, 0.00% Asian, 0.00% Pacific Islander, 0.00% from other races, and 0.47% from two or more races. 1.19% of the population were Hispanic or Latino of any race.
There were 796 households, out of which 28.1% had children under the age of 18 living with them, 51.5% were married couples living together, 16.0% had a female householder with no husband present, and 27.1% were non-families. 24.7% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.84.
In the CDP, the population was spread out, with 22.7% under the age of 18, 8.1% from 18 to 24, 28.3% from 25 to 44, 25.0% from 45 to 64, and 16.0% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 90.9 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the CDP was $30,625, and the median income for a family was $35,417. Males had a median income of $25,217 versus $18,958 for females. The per capita income for the CDP was $15,953. About 7.6% of families and 9.5% of the population were below the poverty line, including 12.7% of those under the age of 18 and 9.3% of those 65 and older.