where is the TO(person to whom the letter is written) address supposed to be written?

You are not required to write the word 'to' before the addressee in a letter. 

For the complete format, follow the given link:

https://www.meritnation.com/ask-answer/question/please-show-aformat-of-formal-letter-and-a-informal-letter/english/4181261

 

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