Monarch Mill URL: https://knowledge.ivjn.us/en/places/sc-monarch-mill.html Monarch Mill is a census-designated place in Union County, South Carolina, United States. **Monarch Mill** is a census-designated place in [Union County](https://knowledge.ivjn.us/en/places/sc-union-county.html), [South Carolina](https://knowledge.ivjn.us/en/places/south-carolina.html), United States. Updated: 2026-11-01 Relations: - Located in: Union County https://knowledge.ivjn.us/en/places/sc-union-county.html Sources: - GeoNames US dataset (US.txt / admin2Codes.txt) https://download.geonames.org/export/dump/US.zip