As of August 3, 2010, the rate to mail a square envelope in the United States, domestic first class mail, was 64 cents.
Yes it does. It is .20 cents more for a square envelope. You can look it up on usps.com. Right now it's .65 cents to mail a square envelope.
An envelope with a height exceeding 6 and one-eighths inches, and any square envelope, is non-machinable. Therefore, the rate for first class US domestic postage is $.64.
"No, the cost of mailing a letter doesn't depend on the shape of the envelope but how much weight is actually inside the envelope. It's based on the weight."
The cost to mail a manila envelope will depend on the size of the envelope and the weight of the envelope. The average cost to mail a manila envelope that is 8"X11" is about $2 if the contents weigh less than one pound.
how much postage does it take to mail a W2 envelope
It currently costs 44 cent to mail a regular envelope, which is the price for a stamp.
The cost to mail a 5.75 x 8.75 envelope will depend on the weight of the envelope. As of May 2014, the cost to mail a standard letter is 49 cents.
$0.61
In March 2018, the cost to mail a square envelope through the United States Postal Service (USPS) was based on its weight and dimensions. A square envelope that met the criteria for First-Class Mail would typically require additional postage due to its non-machinable nature. As of that time, the starting rate for a First-Class Forever stamp was $0.50, but non-machinable square envelopes generally required additional postage, often totaling around $0.71 or more, depending on weight.
8x11
4.2 oz
5.25 X 5.25 envelope