'Tis the season for little boys and girls to write Santa with their wish lists — and the Postal Service (search) has some tips to ensure those letters get to him.

Parents should help their children address and stamp the letters, the agency said Thursday. Also, make certain that letters addressed to Santa at the North Pole (search), Alaska, include a complete return address with a Zip code.

Children can also get a personal reply with a postmark from the North Pole, but they'll need a little help from Mom or Dad. The Postal Service says parents can write a personal response to their child and send it to the post office in Fairbanks, Alaska.

Parents should place the response in a stamped envelope addressed to the child, including a North Pole return address. Put that envelope inside a larger one and mail it to:

North Pole Christmas Cancellation

Postmaster

5400 Mail Trail

Fairbanks, AK 99709-9998

The Postal Service will apply a North Pole postmark to the letter and deliver it back to the youngster.

The letters must arrive in Fairbanks by Dec. 15 to ensure they are returned on time. The post office asks that requests be mailed by Dec. 10.