Prahova (Romanian pronunciation: [ˈprahova]) is a county (județ) of Romania, in the historical region Muntenia, with the capital city at Ploiești.

In 2011, it had a population of 762,886 and the population density was 161/km². It is Romania's third most populated county (after the Municipality of Bucharest and Iași County), having a population density double that of the country's mean.

The county received an inflow of population who have moved here due to the industrial development. More info on: [www.infoprahova.com ]

This county has a total area of 4,716 km².

The relief is split in approximately equal parts between the mountains, the hills and the plain. In the North side there are mountains from the southern end of the Eastern Carpathians - the Curvature Carpathians group; and the Bucegi Mountains the Eastern end of the Southern Carpathians group. The two groups are separated by the Prahova River Valley.

The south side of the county is a plain, on the North West side of the Romanian Plain.

The main river is the eponymous Prahova River. It flows from the mountains, through the Prahova Valley collecting many other rivers - the Doftana River, the Teleajen River and others.

The area contains the main oil reserves in Romania with a longstanding tradition in extracting and refining the oil. The county is heavily industrialised, more than 115,000 people being involved in industrial activities. It contributes to over 8% of the country's industrial production. Some of the biggest international corporations like Coca-Cola, Unilever, InBev, Johnson Controls, Cameron, Weatherford, Michelin, Timken and others have invested heavily in the recent years.

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