Yes. All international mail is sent with the postage from the country of origin.
You use the postage of the country of origin, in this case, you would use Canadian postage.
No, you can't. You should go to your local U.S. post office and purchase a Canadian stamp to mail your letter.
If it is in the US, one stamp.
Ohio is a state, one stamp.
current postage stamp rate is $0.42
The cost is 98 cents to send an ordinary letter to Europe from the US.
From the US, it costs 94 to send a letter to the UK.
One 69 cent US stamp for a letter or postcard
The current rate is 44 cents for standard First Class Mail.
Have to use postage from country of origin
It costs the same to send a letter anywhere in the US to anywhere in the US. The current price of a first class stamp is 42 cents. So, it will cost you 42 cents from California to Iowa.