From Ohio History Central
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| image = [[File:Oil Tank Fire in Lima, Ohio.jpg]]
| caption = Oil tank on fire in Lima, Ohio, ca. 1886-1888. The fire produced a large cloud of smoke and a crowd of onlookers has gathered. This photograph is part of a collection compiled by Henry Howe while researching the 1889 edition of "Historical Collections of Ohio."
<p>Drilling for oil in Ohio began in 1860. Drillers opened the first oil well in Ohio history near Macksburg, in Washington County. Additional wells soon appeared in Washington County and Noble County as well. By 1950, various companies had drilled more than 175,000 wells in forty-five Ohio counties. These wells had produced approximately 615 millions of oil. Most of Ohio's oil reserves are located in northwestern and eastern parts of the state, with the largest concentrations being located south of Toledo. As of 1950, oil companies guessed that the equivalent of another twenty-eight million barrels of oil remained under Ohio's surface.</p>
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