September 18 marks National Cheeseburger Day, but customers at Wendy's ($WEN) have had multiple reasons to celebrate this juicy holiday since September 8. That is thanks to a promotion that offers a free Dave's Single cheeseburger every day until September 30 with the purchase of any item on the company's mobile app.

But where can potential customers cash in on a free cheeseburger? And what can we infer from where these burger joints are located? Of course, we have the data to help answer both of those sizzling questions.

Mapping out Dave Thomas' burger empire

Because the burger deal only applies to Wendy's in the United States, it's best only to track locations in the U.S. Right now, there are 5,767 Wendy's across the country. Florida has the most Wendy's out of any state with 507 stores, and is home to three of the top five cities — Miami, Jacksonville, and Orlando — with the most Wendy's locations.

State Wendy's Store Count State Wendy's Store Count
FL 510 WV 69
OH 408 KS 65
TX 399 AR 64
GA 280 MN 60
CA 262 WI 55
PA 257 CT 47
NC 254 NM 42
MI 249 IA 42
VA 219 NV 42
NY 214 OR 40
IL 191 OK 40
IN 179 ID 31
TN 176 NE 29
NJ 141 NH 23
KY 141 RI 18
CO 126 ME 17
SC 125 MT 14
LA 122 WY 14
MD 101 DE 13
AL 100 HI 9
AZ 98 SD 9
MO 98 AK 8
MA 95 ND 8
MS 94 VT 4
UT 84 DC 3
WA 78

City State (Abrv.) Wendy's Store Count
Houston TX 42
Miami FL 40
Columbus OH 38
Jacksonville FL 33
Orlando FL 31
San Antonio TX 29
Chicago IL 25
Dallas TX 25
Charlotte NC 25
Louisville KY 24

Surprisingly, the city where Wendy's was founded — Columbus, Ohio — ranks third in total store count behind Houston, a mecca for fast-food places, and Miami, Florida. In fact, its original location, opened on November 15, 1969, was shut down due to declining sales in 2007.

Also of note is New Jersey, the home state of Wendy's founder Dave Thomas, having the 14th most stores out of the 50 states plus Washington D.C.

Square patties vs. the Big Mac

While seeing the exact cities and states with the most Wendy's locations is interesting on its own, looking at where it stacks up against its main competitor, McDonald's ($MCD) paints a telling picture of its retail strategy.

Like other fast food restaurants, most Wendy's locations are franchise based, meaning that someone with $2-3.5 million can apply to build a Wendy's and open it up anywhere in the United States. However, Wendy's does offer "site selection assistance," and part of the franchising process involves location approval from the company.

Wendy's has far less restaurants than McDonald's in the country, specifically 5,767 against the Golden Arches' 13,965 locations. Although these two are national competitors, they are not in too much competition on a local level.

When mapping out every Wendy's location in the United States by the number of McDonald's within a tenth of a mile radius — a decent walking distance between locations — there are less than a thousand stores with a McDonald's nearby. Specifically, only 15% of Wendy's restaurants have a McDonald's within a tenth mile radius near them (listed as Wendy's(1) on table).

In terms of a half-mile radius, or a few minutes on the road to the next drive-thru, local competition increases, but there is still a sizable chunk of Wendy's that stand alone. While 54.5% of Wendy's have at least one McDonald's location nearby (represented by Wendy's (1) on the next map), 43.37% of them have zero Golden Arches near them. 

Almost all of the six Wendy's with an extreme amount of competition — at least four McDonald's — within near-driving distance are located in Manhattan, with one outlier in the heart of Boston. One Wendy's location, at 335 5th Ave. right near the Empire State Building, has the most local competition with nine McDonald's within a half-mile radius.

Although there is a large chunk of Wendy's near its main competitor, it seems that the restaurant tends to be in areas where McDonald's are less frequent.

Deep fried demographics: the median income of neighborhoods with Wendy's

Another indicator of Wendy's' location strategy is to look at the customers it serves.

The average median income for a Wendy's location is $69,119.99 when looking at the 5,586 restaurants tracked with zip code data. This is over $10,000 more than the average median income in the United States in 2016, but still within the middle class income bracket. Sorting all Wendy's locations by median income data also reflects a tendency to open franchises in middle class neighborhoods, with more restaurants located in poorer neighborhoods than in wealthier ones.

For direct comparison's sake, the average median income for a McDonald's restaurant location is $68,870.89, while the same metric for Shake Shack ($SHAK), a higher-end burger restaurant based in New York, is $106,871.17.

The neighborhood with the highest median income and a Wendy's is Bellaire, Texas, regarded as the "richest town in Texas." On the other extreme, two zip codes in Cincinnati, Ohio with a Wendy's have an average median incomes of $12,466 and $13,828.

Because we can: tracking Wendy's Twitter following

As an aside, Wendy's is also known for being one of the sassiest fast food accounts on Twitter. Its unique style of how a brand should act on social media gave the company extraordinary Twitter follower count growth since the beginning of 2017, with the occasional outbreak in net followers coinciding with some of its positively savage Tweets.

The Tweet that began two years of fresh, never frozen takes:

In response to IHOP's "IHOB" name change:

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