What this means: under 3 months of inventory means sellers hold the upper hand in Central Islip right now. Homes are selling over asking on average, at 105.5 percent of list price, in a median of 35 days. One caveat, always: a median can move because different kinds of homes sold, not because values changed. The trend numbers matter more than any single month.
As of 2026-06, the median sold price in Central Islip was $540,000. Medians shift with the mix of homes sold, so treat it as a compass, not an appraisal.
Right now Central Islip is a seller market, based on 1.8 months of inventory. Under 3 months favors sellers, over 6 favors buyers.
The median is 35 days on market as of 2026-06. Well prepared and well priced homes move faster than the median.