The Ohio Affidavit As To Service is a document used to prove that a party has been served with legal documents in the state of Ohio. It is the sworn statement of the individual who served the documents, and it includes information such as the date, time, and method of service. There are two types of Ohio Affidavit As To Service: personal service and substituted service. Personal service requires the documents to be physically delivered to the party, while substituted service allows for the documents to be sent to the party’s last known address and/or delivered to another person at the same address. The Ohio Affidavit As To Service must be signed and notarized in order to be valid.