Ohio Rev. Code § 515.04
The township fiscal officer shall fix a day, not more than thirty days from the date of notice to the board of township trustees, for the hearing of the petition authorized by section 515.02 or 515.16 of the Revised Code. The township fiscal officer or the fiscal officer's designee shall prepare and deliver to any of the petitioners a notice in writing directed to the lot and land owners and to the corporations, either public or private, affected by the improvement. The notice shall set forth the substance, pendency, and prayer of the petition and the time and place of the hearing on it.
A copy of the notice shall be served upon each lot or land owner or left at the lot or land owner's usual place of residence, and upon an officer or agent of each corporation having its place of business in the district or area, at least fifteen days before the date set for the hearing. On or before the day of the hearing, the person serving the notice shall make return on it, under oath, of the time and manner of service and shall file the return with the township fiscal officer.
The township fiscal officer or the fiscal officer's designee shall give the notice to each nonresident lot or land owner, by publication once, in a newspaper of general circulation in the county in which the district or area is situated, at least two weeks before the day set for hearing. The notice shall be verified by affidavit of the printer or other person knowing the fact and shall be filed with the township fiscal officer or the fiscal officer's designee on or before the day of hearing. No further notice of the petition or the proceedings under it shall thereafter be required.
R.C. § 515.04