Tlalchapa is a city and seat of the municipality of Tlalchapa, in the state of Guerrero, south-western Mexico. ...[municipality] Tlalchapa is one of the 81 municipalities of Guerrero, in south-western Mexico. The municipal seat lies at Tlalchapa. The municipality covers an area of 414.3 km². As of 2005, the municipality had a total population of 11,286. ...