How many stamps do i need to send a letter from C.A to I.L?

Question

How many stamps do i need to send a letter from C.A to I.L?

Answer 1

As long as as it is regulation size and shape, not over sized or excessive weight, I believe it is $0.42 per letter.  And, as noted, the correct abbreviations are CA for California, and IL for Illinois

Answer 2

one unless the weight is high then you would need to weigh it and check it.

Answer 3

from California to Illinois? it is 1 stamp if in a regular envelope.  But i am not sure what C.A and I.L are so discard if it is another country code or something....The proper abbreviations for California is CA and Illinois is IL   No dots.