Yes, you have to prepay postage with a stamp even on a local letter.
The PO no longer delivers w/o postage.
Yes. The USPS requires a stamp, or payment of postage, to transport anything to anywhere.
yes
yes, you pretty much ALWAYS need a stamp to send a letter in the mail. :)
3 Just one stamp will do it for a normal letter.
Duplicate question
No, you can't. You should go to your local U.S. post office and purchase a Canadian stamp to mail your letter.
The stamp has to be accepted where you mail the letter. If you are mailing in Canada, you need a Canadian stamp. If you are in the US mailing to Canada, you can use a US stamp.
That is what they are used for, to send a letter to another place in the country.
If you want to send it in the post then a name, address and stamp are required
Depends from where you send it. Ask in your local post office.
No.
Yes, you do