South Lyon
- County:
- Oakland County
- County Seat:
- No
- Area (mi²):
- 3.741
- State:
- Michigan
South Lyon is a city located in Oakland County, Michigan. South Lyon has a 2026 population of 12,219. South Lyon is currently growing at a rate of 1.49% annually and its population has increased by 4.2% since the most recent census, which recorded a population of 11,726 in 2020.