Harry and Esther Snyder founded In-N-Out in 1948. The company has remained a family owned business ever since.

In-N-Out pays its employees higher-than-average wages and attracts strong workers who thrive in a fast-paced environment.

The brand earned an Overall Score of 70.6 percent, nearly 8 percentage points higher than the No. 2 burger chain. Overall Scores are based on an average of scores on a variety of attributes — such as Food Quality, Service and Atmosphere — weighted by the importance that diners in that segment put on each attribute.

In-N-Out has kept its growth slow, with just 311 locations despite a nationwide reputation.

Among the 112 Limited-Service chains, the brand received the highest scores on three out of 10 attributes: Reputation, Food Quality and Likely to Recommend. Attribute scores reflect the percentage of respondents who said a chain was "outstanding" or "above average" in that area.

In-N-Out's two highest attribute scores were 85.0 percent for Reputation and 84.5 percent for Food Quality, which were also the highest scores in those areas for all Limited-Service brands. In-N-Out’s next-highest scores were for Likely to Recommend and Service, respectively.

In-N-Out’s simple menu enables the chain to focus on quality and operations without worrying about adding new products.

A perennial high scorer in the Consumer Picks survey, In-N-Out Burger this year earned the third-highest Overall Score among Limited-Service restaurants. It was the highest scoring non-dessert chain in the segment.

Quality is a big focus for In-N-Out. The chain cuts its fries from potatoes right in front of the customer.

The chain's lowest score was 34.6 percent for Menu Variety. In-N-Out is known for its simple, streamlined menu of burgers, fries and drinks. It’s second-lowest score was 53.6 for Atmosphere, which was still the second-highest Atmosphere score among burger chains.