The chronological history of Plain City. Ohio.
| Year |
Date |
Event |
| 1761 | Aug. 4 | Birth of Rev. Jeremiah Converse, a pioneer Methodist minister |
| 1773 | Sept. 17 | Birth of Jonathan Alder, first white settler in Madison County |
| 1774 | Sept. 26 | Birth of John Chapman, surveyor of Westminster and Pleasant Valley |
| 1782 | March | Jonathan Alder captured by Mingo Indian Tribe |
| 1795 | Jonathan Alder married an Indian woman named Barshaw | |
| 1797 | Lucas Sullivant recorded a plat in Jerome Township called North Liberty, later abandoned | |
| 1797 | July 25 | Birth of Isaac Bigelow, founder of Westminster |
| 1798 | Oct. 29 | Joshua and James Ewing settled in Union County. First white settlers. |
| 1799 | Nov. 4 | Birth of Jesse Mitchell, first white child born in Union County |
| 1803 | Jan. 11 | Edward Tiffin elected first governor of Ohio |
| 1803 | Mar. 1 | Ohio became the 17th State |
| 1804 | Mar. 26 | Birth of Otway Curry – legislator, journalist and poet |
| 1806 | Jonathan Alder built log cabin and married Mary Blount | |
| 1807 | Mar. 7 | Earliest grave found in old Darby Township Cemetery Stephen Winget |
| 1808 | June 15 | Lower Liberty Presbyterian Church organized by Rev. Archibald Steel. First Pastor – Rev. Samuel Woods – ordained this date. |
| 1810 | Mar. 1 | Madison County formed |
| 1810 | Mar. 1 | Big Darby Baptist Church was formed |
| 1810 | Daniel Taylor and his brother bought land along Big Darby Creek. | |
| 1810 | Spring | Post Road, from Worthington to Urbana, opened. First gravel road in the area. Now State Route 161. |
| 1812 | Methodist Church was organized | |
| 1815 | Earliest Presbyterian Church was built on the banks of Big Darby Creek. | |
| 1817 | Aug. 23 | Birth of Sammy Taylor – donor of the Town Clock |
| 1818 | June 11 | Westminster surveyed by David Chapman |
| 1818 | June 23 | James Ewing appointed first Postmaster of Darby Creek Post Office. |
| 1820 | March 29 | Albert N. Converse appointed Postmaster |
| 1820 | April 1 | Union County formed from parts of Madison, Delaware, Franklin, Logan and part of the Indian Territory. |
| 1820 | Indians left Madison County | |
| 1821 | March 12 | Jerome Township organized |
| 1821 | Dedication of Methodist Block Church | |
| 1823 | June 23 | Westminster name changed to Pleasant Valley |
| 1823 | Aug. 16 | Death of Dr. Israel Bigelow, father of Isaac |
| 1826 | New California Presbyterian Church was organized | |
| 1831 | Sept. 23 | Birth of James Thomas Black. State legislator. Built the two Black Buildings. |
| 1832 | Feb. 2 | William Atkinson founded the Farmer’s Bank |
| 1832 | Universalist Church was organized | |
| 1836 | The “Old Red Brick” Presbyterian Church constructed. | |
| 1837 | Mar. 22 | Daniel Bigelow appointed Postmaster |
| 1837 | June 26 | Death of Rev. Jeremiah Converse – pioneer Methodist Minister and Revolutionary War Veteran |
| 1839 | Feb. 16 | Pleasant Valley incorporated |
| 1842 | Dec. | Isaac Bigelow elected Mayor of Pleasant Valley |
| 1843 | Aug. 17 | Isaac Bigelow appointed Postmaster. |
| 1848 | Small brick Methodist Church constructed – north side of East Main Street. | |
| 1849 | Jan. 30 | Death of Jonathan Alder |
| 1850’s | Pleasant Valley was an important station of the Underground Railroad. | |
| 1850 | Feb. 21 | Peter Gudtner appointed Postmaster |
| 1850 | June 9 | Birth of Charles Jones – breeder of Percheron Horses – owner of Pleasant Valley Farm. |
| 1852 | Jan. 25 | Pleasant Valley Odd Fellows Lodge chartered |
| 1852 | May 11 | Birth of Charles Fairbanks – took office as Vice President of The U. S. with Theodore Roosevelt. |
| 1853 | July 4 | First train from Columbus to Urbana passes through Pleasant Valley. |