No. Yom Kippur is not a federal holiday in the US, so government offices, banks and schools follow their normal schedule unless they choose otherwise.
When is Yom Kippur 2012?
Yom Kippur 2012 falls on Wednesday, September 26.
Why does the date of Yom Kippur change each year?
It follows the Hebrew calendar, a lunisolar calendar whose months follow the moon. The Gregorian date moves each year but stays within the same season.