From Attom:
Percentage of Seriously Underwater Properties: 3 percent of mortgaged residential properties, where the combined estimated loan balances are at least 25 percent more than the property’s estimated market value…
Below is the complete state-by-state ranking for the fourth quarter of 2025, listing each state’s share of seriously underwater properties and the top four counties with the highest percentages of seriously underwater homes…
Illinois
4.7% seriously underwater, up from 4.2% last quarter and up from 4.5% last year
Counties: Mcdonough, Saline, Marion, Montgomery
