City of San Antonio - Vibrant & Thriving San Antonio is a vibrant city with a thriving economy, deep cultural heritage and communities that are compassionate, inclusive and proudly diverse. It is the seventh largest city in the United States and one of the strongest fiscally managed cities in the country, nurturing entrepreneurship, encouraging investment and funding infrastructure. The City fosters partnership and growth opportunities in aerospace, bioscience, cybersecurity, green technologies, healthcare, and information technology. San Antonio’s famed Riverwalk and Alamo are the top tourist attractions in Texas, and its historic missions are a designated World Heritage Site – the first and only in Texas. Proudly called Military City, USA®, San Antonio is home to one of the largest populations of active duty military and veterans, as well as mission-critical commands, including military medicine, cybersecurity, pilot training and basic training. For more information, visit SanAntonio.gov and follow @COSAGov on social.