Mrs. Castlebrew notes that it would be interesting to know the demographics.
Such as immigration status and country of origin.
There was a reason for mandatory quarantine at Ellis Island.
Rockland County is approximately 35 miles North/NW
from the 'Sanctuary City' of the municipality of New York City.
The County abuts New Jersey to the south, and it's eastern boundary is the Hudson River.
It is considered within commuting distance from NYC.