- Celaya is a city located in the state of Guanajuato, Mexico. It is the third-largest city in the state and has a population of over 500,000 people. Celaya is known for its historical landmarks and rich cultural heritage. The city was founded in 1570 and has a mix of Spanish colonial architecture and modern infrastructure. Celaya is also an industrial and commercial center, with a thriving manufacturing sector. The city is famous for its production of textiles, automotive parts, and food products. Celaya is a vibrant city with a lively street market, traditional festivals, and a strong sense of community.