Lopburi is a province in the central region of Thailand. The province is subdivided into 11 administrative districts, and Mueang Lopburi District is the capital. With over 750,000 people, the province is Thailand's 37th largest area and 38th most populous. There are six neighboring provinces, Phetchabun, Nakhon Sawan, Phranakhon Si Ayutthaya, Saraburi, Nakhon Ratchasima, Chaiyaphum, Singburi, and Nakhon Sawan.