Irwin, SC
Irwin, SC's wildfire risk, in USFS's own numbers
USFS scores Irwin at the 46th national percentile for wildfire risk to structures (modestly above the national average for wildfire risk), a figure built from 702 real buildings rather than raw vegetation cover. (Source: USFS's Wildfire Risk to Communities methodology.)
Separately from the risk score above, Irwin's burn probability — fire likelihood with no building count factored in — sits at the 48th percentile nationally.
What "at risk" means for the buildings here
USFS classifies 87% of Irwin's buildings as Direct exposure, higher than its 13% Indirect share and far above its 0% Minimal share — a profile where 611 structures sit close enough to vegetation that lot clearing matters most.
Where Irwin ranks
Inside South Carolina, Irwin sits at just the 1st percentile even though it scores 46th nationally — the state's overall wildfire exposure is high enough to make this a relatively quiet corner of it. Among the 31,521 US communities USFS scores, Irwin ranks 17,001 for wildfire risk (1 is highest) and 14,640 by building count (1 is largest). Within South Carolina alone, it ranks 471 of 474 places by risk. See the full county-by-county picture for South Carolina on its state page.
Irwin and the insurance market
Irwin's elevated rating (46th percentile nationally) sits outside the range where wildfire risk alone reshapes an insurance market — still, a homeowner here loses nothing by comparing rates.
What would actually reduce this score
Irwin's 87% Direct-exposure share means lot clearing around the structure typically outweighs any single material upgrade here. The home-hardening guide ranks the options for a place shaped like this.
More on how this number was built
Irwin's 46th-percentile score and its burn-probability figure both come from the same USFS workbook, documented in the methodology guide. For more on what direct exposure implies beyond Irwin, see the exposure-zones guide.