There is a strange increase of Jews in New York state since
1940:
<In 1940, 90% of the state's 2,206,328 (1937 figure) Jews
resided in NY City. However, the next two decades saw a flow
of city dwellers, including a disproportionately large
number of Jews, to the suburbs. In 1940 fewer than
100,000 Jews had lived in all the suburbs, but Nassau alone
had 329,000 Jews by 1956 and 372,000 in 1968; Suffolk,
20,000 by 1956 and 42,000 in 1968; and Westchester, 116,900
by 1956 and 131,000 in 1968. The number of permanent Jewish
residents in the upstate resort counties of Sullivan,
Ulster, and Orange did not appreciably increase from
1940.> (col. 1127)
[[And there is no indication where the Jews have come from.
This seems to be a mystery]].