- First Telegraph Message – Received in Dayton on September 17, 1847.
- First United Brethren Church – The first United Brethren church in Dayton was organized in 1847, in a small room in the Oregon Engine House. Their first church building was erected in 1852, at Sixth Street and Logan Street, later being purchased by the city and converted into a city prison.
- First Gas Company – Chartered February 4, 1848, by Daniel Beckel, Peter Voorhees, Daniel Stout, I.F. Howells, David Winter, J.D. Loomis, J.D. Phillips, Valentine Winters, John Mills and Daniel W. Weelock.
- First Hebrew congregation – The first Hebrew congregation was organized in 1850. They met in the old Dayton Bank building until 1863, when they purchased the old Baptist house of worship.
- First Railroad – The first railroad line to enter Dayton was the Mad River & Lake Erie Railroad, between Dayton and Springfield. It was formally opened on January 25th, 1851.
- First Depot = The first railroad depot erected in Dayton stood at the northwest corner of Jefferson Street and Sixth Street, and was finished and occupied in 1851.
- First Town Charter – The first charter of the town of Dayton was granted by the legislature on February 12, 1805. For the next ten years, the town council met at the homes of its various members.
- First President of Council – David Reid, elected at the first meeting held following the formation of the body under the new charter.