National Cheeseburger Day is celebrated every Sept. 18! Although there are many theories on how the cheeseburger started - it dates back to the 1920s.

Lionel Sternberger is reputed to have invented the cheeseburger in 1926 while working at his father's sandwich shop, The Rite Spot, in Pasadena, California. In 1935, a trademark for the name "cheeseburger" was awarded to Louis Ballast of the Humpty Dumpty Drive-In in Denver, Colorado. 

To help you celebrate National Cheeseburger Day we compiled 11 of the best deals you can find in the tri-state area.

Applebee's: Participating locations are offering the Classic Bacon Cheeseburger with endless fries for $6.99 on Sept. 18.

BurgerFi: Buy one BurgerFi Cheeseburger, get one for $1. Offer valid on Sept. 18, at participating locations. Must mention or show offer to redeem. Can't be combined with any other offer or discount. No substitutions. In-Store Orders Only; Offer not valid on online, in-app, phone or delivery orders.

Burger King: Download the Burger King app to get 59-cent cheeseburgers. 

Carl's Jr.: Use this printable coupon from Offers.com to get a free Famous Star with Cheese with purchase of large soft drink, Sept. 18 only.

Checkers: Celebrate with the mix-and-match 2 For Menu. The Fry Lover's Burger, Spicy Chicken Sandwich, Crispy Fish Sandwich and Chili Dog are all 2 for $3. Other sandwiches are 2 for $4 or 2 for $5.

Grubhub: Via its new mobile app offers program, Perks, Grubhub is offering some deals on or around National Cheeseburger Day. The deals can be accessed via the app.

McDonald's: Download the McDonald's app and receive several offers including a $1 McDouble good daily through Dec. 30.

Red Robin: All guests who visit a participating Red Robin on Sept. 18 can get a signature Gourmet Cheeseburger and Bottomless Steak Fries for $5 with any beverage purchase.

Smashburger: Buy one, get one free on the classic Smashburger.

Wendy's: Download the Wendy's app and get a bacon cheeseburger for just $1 when you order via mobile app.

White Castle: Order 10 Cheesy Sliders for only $6.99.