Five up-and-coming restaurant chains taking over America

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5. Chick-fil-A

5. Chick-fil-A

The chicken chain had a standout year, growing sales 18.1% and moving into new markets such as New York City.

One major reason for Chick-fil-A's success: it's incredibly high estimated sales-per-unit, which reached $3.5 million this year. That's more than any other limited-service or chicken concept on the market, and roughly three times as much as an individual location of rival KFC. The secret to Chick-fil-A's success is exceptional customer service, something analysts say sets the chain apart from the competition.

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4. Raising Cane's Chicken Fingers

4. Raising Cane's Chicken Fingers

This is Raising Cane's second year in a row to make NRN's list of the top 10 fastest-growing chains, with sales growth of 21.1%. With 251 locations, the chain is expanding quickly, increasing its store count by 19% in the last year.

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3. Wingstop

3. Wingstop

The fastest-growing chicken chain in America grew sales 21.5%. However, that's nothing new for Wingstop — in March, the company reported 12 consecutive years of sales growth. According to executives, the chain has beat the competition by sticking to a formula that works.

"When we started 21 years ago, we sold wings, sides, and fries," Morrison told Business Insider last year. "We've had the same three sides on the menu since the beginning. We've added boneless wings over the years, and we've added two new flavors. That's innovation for us."

2. Marco's Pizza

2. Marco's Pizza

The 667-location pizza chain is growing sales faster than any other, with an increase of 23.7%. The pizza industry is hot right now, as new tech makes ordering and delivery easier than ever before, and the Toledo, Ohio-based chain is ready to cash in on the trend.

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1. Jersey Mike's Subs

1. Jersey Mike's Subs

This is the third year in a row that Jersey Mike's has led the Top 100 fastest-growing chains list, boosting sales 28.6%.

A large part of this growth is due to rapid expansion. In 2011, the chain had 507 locations. The chain doubled that in four years, breaking the 1,000 unit mark in late 2015.  Jersey Mike's isn't slowing down — by 2019, the company wants to have 2,000 locations.