A proof of residency letter demonstrates that a person is a resident of a certain area or state. This letter may be necessary if you need to prove your eligibility for selection in some program or avail special benefits in the place where you reside. Many other situations call for a proof of address letter. For instance, when you register to vote, you may only need to carry a document which has your address proof, like one of your utility bills. But for cases where you want to receive residency benefits from universities or colleges, you may need to present a verification of residency. Click here to read more.