4,728 employees

http://www.irs.gov/

The IRS operates a processing center here in Austin - very handy when it comes time to mail those April tax returns.

4,400 employees

http://www.roundrockisd.org/

During the past five years, the number of students in the Round Rock district has increased by roughly 21 percent.

4,000 employees

http://www.co.travis.tx.us/

3,285 employees

http://www.austin.cc.tx.us/

Having grown to seven campuses. ACC provides contracted training to many local high tech companies, as well as associate's degree programs in specialized fields like manufacturing and technology.

2,900 employees

http://www.solectron.com/

According to the company's description, Solectron provides electronics manufacturing and integrated supply chain services for industries that rely on high-tech electronics.

2,800 employees

http://www.leanderisd.org/

The Leander ISD includes the cities of Leander and Cedar Park, along with parts of Jonestown and northwest Austin.

2,537 employees

http://www.seton.net/

Brackenridge Hospital is the only Level II Trauma Facility serving the Central Texas area, an acute care hospital and outpatient facility that is also accredited as a teaching hospital. Dell Children's Hospital is a department of Brackenridge Hospital, and is the only hospital in Central Texas dedicated solely to the care of children and adolescents.