While many headed to the King Power Stadium, surreal scenes stretched far beyond with roads becoming packed with honking cars and flag-waving supporters.
Supporters climbed the city's clock tower and partied near the club's King Power Stadium.
Fans had also packed into the Local Hero pub in Aylestone Road, near the stadium. Curtis Leal, 27, of Leicester, said: "I'm in tears, I just can't believe it. What a moment!"
It was the second day in a row the bars and pubs in the East Midlands city were packed out with fans following the action.
The Foxes could have clinched the title themselves on Sunday with a win against Manchester United.
But the game ended 1-1 at Old Trafford after captain Wes Morgan equalised following an early Anthony Martial volley.
A feisty affair between the two London clubs saw Tottenham race into a first-half lead, before Gary Cahill scored to give Chelsea, and Leicester, hope. Eden Hazard equalised for the west London club with eight minutes remaining.
But Tottenham's draw meant the Foxes now have an unassailable lead in the league with two games left to play.
Kimberley Brainer, 22, said: "I don't know whether to laugh or cry - I knew I was going to have a meltdown.
"You've got to give credit to (Claudio) Ranieri, he's been amazing."
Jagdeep Tumber, 19, said: "It won't feel real until I see Wes Morgan or Andy King, who has been at the club through our lowest point, lifting the trophy.
"Just to say that we are champions of England is just incredible."
Gagandeep Bola, 19, said: "We were 5000/1 and we've done it. Incredible."
At least 1,000 fans arrived at the stadium to mark Leicester's historic title win and police officers were photographed joining in the celebrations.
Crowds chanted "Leicester 'til I die" and "Championes!" to mark the Foxes clinching the title.
Richard Hamilton, 23, said: "It's just amazing, the city has come out for this and it's just brilliant for the fans and the city as a whole."
City defender Christian Fuchs posted a video on his official Twitter account showing his team mates, including star striker Jamie Vardy, at the moment they realised they had won.
Selby, dubbed "the jester from Leicester" said: "I'd just like to say a big thank you and a big congratulations to Claudio and all the boys at Leicester."