Harris County is located in the southeastern part of the state of Texas. It is the most populous county in the state and the third most populous in the United States. The county seat is Houston, which is also the largest city in Texas. Harris County covers a diverse area that includes urban, suburban, and rural communities. The county is known for its significant contributions to the economy, particularly in industries such as energy, healthcare, and aerospace. It is home to several major institutions, including the Texas Medical Center, one of the largest medical complexes in the world, and NASA's Johnson Space Center, which plays a key role in space exploration.