It was on this date in 1792 the County of Essex was formally created.
It is the oldest municipality in Ontario, in existence for 75 years by the time of Confederation.
To mark the date, the county put on a celebration at the Civic Centre, complete with the burial of a stainless steel time capsule.
Essex Warden Tom Bain and CAO Brian Gregg (by AM800's Peter Langille)
There was a fair bit of mystery around the contents, which won't be made public for a century.
Essex Mayor Ron McDermott hinted at what the town's contribution is, saying he wrote a letter to the mayor of 100 years from now.
LaSalle Mayor Ken Antaya says the area has a lot of history to celebrate.
"We have the oldest grist mill, the oldest commercial venture in Ontario and that was a grist mill at Turkey Creek and Sprucewood" said Antaya, "This area has such a rich history that sometimes we don't take advantage of"
County CAO Brian Gregg says this is a great event for his last official function before retiring in 2 months.
"It's really great to see after 225 years that the community can come together and celebrate, not just Canada's birthday, but the County of Essex." Gregg added "To think we were one of the first settlements or first municipalities formally settled in what is now Canada is really quite remarkable"
County Road 20 - formerly Highway 18 - is the oldest road in Ontario.
Volunteers form a maple leaf at the Essex Civic Centre (by AM800's Peter Langille)
Essex County celebrates 225 years. Tecumseh gets revenge on LaSalle! pic.twitter.com/COylksNC6O
— Peter Langille (@PLangille800) July 21, 2017
There were events for kids, a bouncy castle, food and a dunk tank where the mayors and warden were at the mercy of those willing to buy balls to toss.