I had no idea there were that many Jews in such places as Madera, Kern, Fresno, Kings.
Surprises me, too. Perhaps it's like how there are no parts of New Jersey or Connecticut where there isn't at least a small number of Jews... some people will always diffuse out from the main urban centers. Las Vegas has a relatively large Jewish population, including the mayor and congresswoman.
Also, Jews vote in higher percentages than the general population, especially in places with huge numbers of non-citizens and people living in poverty like the Central Valley.