The same Census release that put Greenville over a million carries a figure the Upstate's own boosters tend to skip. Between April 2020 and July 2025, Spartanburg County went from roughly 328,000 residents to 380,857. That is a 16.11 percent gain, and it beats Greenville County's 10.96 percent by better than five points.
Net domestic migration says it more bluntly. Spartanburg County took in 44,713 more domestic movers than it lost. Greenville County, working from a population base 60 percent larger, took in 34,197.
Now the part that keeps this honest. The Spartanburg metropolitan area pairs Spartanburg County with Union County on its southern line, and the metro grew 14.76 percent rather than 16.11, because Union went the other way: 27,230 residents in 2020, 26,799 in 2025, a decline of 1.58 percent.
Worth being precise about why. Union did not lose people to out-migration. It took in 492 more domestic movers than it lost, plus 210 from abroad. It shrank because deaths outran births by 1,144. Two counties sharing a line, one absorbing arrivals about as fast as anywhere in the Southeast, the other running a demographic deficit. "The Upstate is booming" is not a sentence that survives a county line.
For anyone looking at the Tryon corridor, this is the arithmetic that applies. The corridor runs from Polk County, North Carolina, down through Landrum into northern Spartanburg County, which puts its South Carolina side inside the county doing the absorbing rather than the one people assume is doing it. Buyers who treat a Spartanburg County address as the compromise version of a Greenville County one are reading a map instead of a trend line.
Statewide, Spartanburg is not the leader. Myrtle Beach-Conway-North Myrtle Beach grew 21.80 percent over the same five years, the fastest metro in South Carolina. Hilton Head Island-Bluffton-Port Royal grew 12.53 percent, Charleston-North Charleston 11.21. Spartanburg sits second on growth rate and almost nowhere in the conversation.
What none of these figures tell you is price, inventory, or what a particular farm on the Landrum side is worth this month. Growth rates and closing prices are related, loosely, with a lag nobody has ever timed cleanly.
If you want the corridor read rather than the county read, the advisory conversation is complimentary.
All Field Notes