The addresses are not required and are usually not even included.  A power of attorney is legally sufficient if the power of attorney contains the date of its execution (date it is signed); it is signed by either the principal (the person granting power of attorney) or in the prinicipal's name by some other person or in the prinicipal's presence and at the principal's direction; the power of attorney is either acknowledged before a notary public or signed by at least two witnesses.Each witness has to be an adult and each witness signing the power of attorney shall witness either the signing of the instrument by the principal or the principal's acknowledgment  of the signature or the power of attorney.These are general requirements for a power of attorney and your state may have different requirements. As for addresses, the address of a witness usually appears below their signature.