The Origins of Shiloh County begins with Fort Shannon during the French-Indian War when the Fort was built on Lake Ontario in 1756.  Soon after the war, settlers began to live in the surrounding areas of the Fort and the other cities and towns of the county began to form.  Delmore, Oxnard, and Arcadia were the first lands outside of Fort Shannon to fill out with settlers living in those areas.  Delmore was the first of those three cities to get recognized and established as town in 1771.  Arcadia, in 1773, was next to be established as a town and in 1779 Oxnard was officially established as a town.

After the American Revolutionary War end the locals in the area ventured out further into the lands of the county and the areas of Kimberly and Essex were inhabited.  Both areas were great for farming but later on Clinton and Crescent Falls would split and take away land from those towns but we'll get to that part later.  In the 1790s a new state of the US was founded when a large part of New York decided to split from the state and became Saratoga.  Shiloh County was apart of this new state and became one of the first established counties of Saratoga taking the Fort Shannon, Arcadia, Delmore, Oxnard, Essex and Kimberly as it's towns and cities within it's borders.

In the 1840s mills were built in the western lands of Kimberly after the locals there started to have trouble farming the lands there.  Within the decades to follow other industries started to pop up and the area flourished as the population grew.  In 1872, the lands eventually became Clinton after officially splitting away from Kimberly.  Similarly, with the founding of a college in 1883, the population of Essex grew in it's eastern parts and later became it's own city, known as Crescent Falls, in 1891.