[3] It lies In the Teleajen river valley, 28 kilometres (17 mi) north of the county seat of Ploiești.

In 1645 Vălenii de Munte (or Văleni for short) became the official residence of the then Săcueni County.

At the end of the 19th century, Vălenii de Munte was an urban commune, formed from the Văleni (Târgul-Văleni), Turburea, and Valea Gardului villages, having a total of 3,000 residents, who benefited from having a local hospital, pharmacy, post office, and telegraph station.

In 1907 the historian Nicolae Iorga settled in Văleni, opening in January 1908 the People's Summer University.

The status was lost in the 1968 Administrative Reform, when Văleni became one of the towns of the newly established Prahova County.