Which companies are making the most money on campus?

Apple campus Austin, Texas (CNN) Apple campus Austin , Texas, is one of the world’s hottest tech hubs.

Its population of more than 100,000 students, and its tech giants like Apple, Google, Facebook, Twitter and Yelp are home to more than 5,000 employees and more than 1,000 contractors. 

Its top employers are Apple, the world leader in consumer technology, and the Google campus in Mountain View, California.

The Austin campus was founded in the early 1960s as a research and development facility for the state of Texas to expand its electrical grid.

Since then, the Austin campus has grown to become the fourth-largest campus in the US, according to the Bureau of Labor Statistics.

The Austin campus is home to the largest concentration of engineers in the country, with an estimated 1,200 employees and $9 billion in annual revenues, according the US Census Bureau.

 While it’s a huge employer in Texas, its employees have to contend with the heat of a climate where temperatures are up to 40 degrees (F) and humidity in excess of 95%, the Texas Tribune reported.

Austin’s proximity to the San Francisco Bay Area is another challenge.

According to the U.S. Centers for Disease Control and Prevention, the average annual daily temperature in Austin is 77.5 degrees, making it one of three hottest places in the U: Atlanta and San Jose, California, are the other two hot spots.

While Austin’s climate may not be the best for some workers, it’s not a bad deal for Apple employees.

In 2015, the company spent $9.6 million to move a manufacturing plant to the campus, and it will also soon open a research center, according The Wall Street Journal.

The plant, dubbed the Innovation Lab, will employ 10,000 workers, including more than 200 at the Austin facility.

Read more: What do tech firms make on campus, anyway?