Nope. BNL is a ~30 minute drive from Islip. BNL is sandwiched between Ridge/Middle Island, Yaphank, and Shorham Wading River (10 minutes from where the aborted SWR nuclear power plant rests). BNL belongs to the township of Brookhaven.
Meanwhile, Islip is the home of McCarthur Airport, a medium sized airport that serves the east end of Long Island.
Location with highest average salary among stations with >25 federal employees:
Islip, NY - 496 employees
$43,162 min
$140,781 avg
$179,700 max