Estimates of the median household income on Long Island were essentially flat in 2017 landing at $108,133 in Nassau and $94,750 in Suffolk, according to data from the U.S. Census Bureau's American Community Survey. The statistically insignificant declines in median income amounted to $4 in Suffolk and $43 in Nassau.
The Census also estimates that 6 percent of Nassau residents and 6.8 percent in Suffolk live below the poverty level. The bureau estimates that 4.8 percent in Nassau and 4.5 percent in Suffolk have no health insurance.
Median household income
Nassau ranks first among the 39 largest counties in the state, and Suffolk ranks third. (Putnam slips in between.) Median income is the point at which half the households have higher income and half have lower.
Percent lacking health insurance
Percent living below poverty level