High Quality Content by WIKIPEDIA articles! Hertfordshire is an English county, founded in the Norse–Saxon wars of the 9th century, and developed through commerce serving London. It is a land-locked county that was several times the seat of Parliament. Today, with a population slightly over 1 million, Hertfordshire retains much of its historic character, but its industry and commerce have changed radically. From origins in brewing and papermaking, through aircraft manufacture, the county has developed a wider range of industry in which pharmaceuticals, financial services and film-making are prominent.