Census-designated place · South Carolina
Monarch Mill, South Carolina
Monarch Mill, census-designated place, in Union County, South Carolina. Monarch Mill had 1,584 residents in the 2020 Census, a full count; the ACS 2020-2024 5-year estimates put it at 1,822 (±386). GEOID 4547200.
Residents, 2020 Census
1,584
Census count or controlled total
ACS 2020-2024 estimate: 1,822 ±386
Median household income
$39,350
±$4,614 (90% margin)
South Carolina: $69,324
Median home value
$82,600
±$31,696 (90% margin)
South Carolina: $259,000
Median gross rent
$666
±$86 (90% margin)
South Carolina: $1,180
Where is Monarch Mill and what county is it in?
Monarch Mill is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Union County, South Carolina. It covers 5.6 square miles of land, 283 residents per square mile in 2020.
Monarch Mill is in the Spartanburg, SC metropolitan statistical area, which takes in 2 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Monarch Mill, and is it growing?
The 2020 Census counted 1,584 residents in Monarch Mill, a full count rather than a sample. The 2020-2024 American Community Survey, a sample, estimates 1,822 (±386).
The Census Bureau publishes yearly population estimates for incorporated places only; Monarch Mill is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Monarch Mill | Union County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,822 ±386 | 26,885 | no clear change |
| Households | 732 ±135 | 11,611 | no clear change |
| Average household size | 2.49 ±0.36 | 2.28 | no clear change |
| Housing units | 780 ±138 | 13,527 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Monarch Mill?
The median resident of Monarch Mill is 33.4 years old; 28.1% are under 18 and 18.6% are 65 or older. The largest group is non-Hispanic white residents at 57.8%, then non-Hispanic Black residents at 20.5%.
| Measure | Monarch Mill | Union County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 33.4 ±8.2 | 44.5 | no clear change |
| Under 18 years | 28.1% ±6.1 pts | 20.8% | – |
| 65 years and over | 18.6% ±5.3 pts | 21.6% | – |
| Male | 48.5% ±6.7 pts | 47.2% | – |
| Hispanic or Latino (any race) | 0.1% ±0.5 pts | 2.1% | – |
| White alone, not Hispanic | 57.8% ±12.5 pts | 64.2% | no clear change |
| Black or African American alone, not Hispanic | 20.5% ±12.7 pts | 27.5% | no clear change |
| Asian alone, not Hispanic | 0.2% ±0.4 pts | 0.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.9% ±1.4 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±2.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 20.4% ±12.8 pts | 5.6% | – |
| Some other race alone, not Hispanic | 0.0% ±2.4 pts | 0.1% | – |
| Born outside the United States | 0.2% ±0.4 pts | 1.5% | – |
| Speak a language other than English at home (age 5+) | 1.1% ±1.4 pts | 2.4% | – |
| Civilian veterans (age 18+) | 3.4% ±2.8 pts | 7.8% | – |
| With a disability | 20.9% ±7.0 pts | 21.7% | – |
| No health insurance coverage | 17.0% ±9.1 pts | 10.5% | – |
| High school graduate or higher (age 25+) | 89.0% ±5.4 pts | 82.1% | – |
| Bachelor's degree or higher (age 25+) | 6.0% ±3.8 pts | 15.0% | – |
| Graduate or professional degree (age 25+) | 1.7% ±2.0 pts | 3.6% | – |
| Lived in the same house a year earlier | 87.0% ±9.5 pts | 91.3% | – |
| Moved from another state in the past year | 1.4% ±2.3 pts | 0.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Monarch Mill earn?
Half of Monarch Mill's 732 households earn less than $39,350 a year (±$4,614), against $41,621 in Union County and $69,324 in South Carolina. 21.0% of residents live below the poverty line.
| Measure | Monarch Mill | Union County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $39,350 ±$4,614 | $41,621 | – |
| Mean household income | $50,988 ±$9,111 | $60,230 | – |
| Per capita income | $22,061 ±$5,584 | $27,229 | – |
| People below the poverty line | 21.0% ±11.9 pts | 22.6% | no clear change |
| Children under 18 below the poverty line | 30.5% ±23.3 pts | 36.1% | – |
| Households receiving SNAP | 17.3% ±8.8 pts | 19.6% | – |
| Households with a computer | 90.3% ±7.5 pts | 88.5% | – |
| Households with a broadband subscription | 87.3% ±7.8 pts | 82.3% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Monarch Mill?
Owners occupy 74.2% of Monarch Mill's occupied homes and renters 25.8%. The median owner-occupied home is valued at $82,600 by its owner (±$31,696). The median renter pays $666 a month including utilities.
| Measure | Monarch Mill | Union County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $82,600 ±$31,696 | $103,600 | no clear change |
| Median gross rent | $666 ±$86 | $804 | −$471 |
| Renters paying 35% or more of income on rent | 12.2% ±18.6 pts | 43.8% | – |
| Median monthly owner costs, with a mortgage | $780 ±$223 | $997 | – |
| Owner-occupied homes | 74.2% ±12.6 pts | 71.3% | no clear change |
| Renter-occupied homes | 25.8% ±12.6 pts | 28.7% | – |
| Housing units | 780 ±138 | 13,527 | no clear change |
| Homeowner vacancy rate | 0.0% ±7.9 pts | 0.5% | – |
| Rental vacancy rate | 0.0% ±21.0 pts | 4.8% | – |
| Single-family detached homes | 73.7% ±13.8 pts | 68.7% | – |
| Mobile homes | 23.3% ±12.3 pts | 21.2% | – |
| Built 2020 or later | 0.0% ±5.6 pts | 1.0% | – |
| Built 2010 to 2019 | 0.0% ±5.6 pts | 3.3% | – |
| Built 1939 or earlier | 14.9% ±8.3 pts | 15.2% | – |
| Households with no vehicle | 0.7% ±1.3 pts | 10.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Monarch Mill work and get to work?
76.0% of Monarch Mill's workers drive alone. The average trip to work takes 27.1 minutes.
| Measure | Monarch Mill | Union County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 47.1% ±8.0 pts | 53.5% | – |
| Unemployment rate | 9.6% ±10.9 pts | 7.9% | – |
| Drove alone to work | 76.0% ±14.1 pts | 83.5% | – |
| Carpooled | 19.4% ±13.8 pts | 11.7% | – |
| Public transportation | 0.0% ±7.5 pts | 0.0% | – |
| Walked | 0.7% ±1.5 pts | 0.6% | – |
| Worked from home | 0.9% ±1.5 pts | 3.4% | – |
| Mean travel time to work | 27.1 min ±4.7 | 27.4 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Monarch Mill?
No census tract lies mostly in Monarch Mill; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 303Union County | 3,902 | $39,958 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Monarch Mill) · Census block assignment files
How does Monarch Mill compare with other places in South Carolina?
Monarch Mill ranks 205th of 248 places in South Carolina with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 210th | 261 |
| Residents per square mile | 243rd | 261 |
| Median household income | 205th | 248 |
| Per capita income | 215th | 259 |
| Median home value | 232nd | 248 |
| Median gross rent | 218th | 235 |
| Poverty rate | 102nd | 214 |
| Bachelor's degree or higher | 224th | 226 |
| Median age | 212th | 261 |
| Owner-occupied share | 92nd | 258 |
| Travel time to work | 79th | 261 |
Monarch Mill's figures with every place in South Carolina (CSV)
Every place in South Carolina, sortable · Compare Monarch Mill with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Monarch Mill?
22 of the 57 figures for Monarch Mill on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Monarch Mill are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.