Hertfordshire County Council estimated the county at 1,236,200 people as at 30 June 2024. Tesco runs its head office from Shire Park in Welwyn Garden City, not Cheshunt, whatever the old directories still say. Roche Products is a few streets away on Falcon Way. Airbus Defence and Space and MBDA both build from Stevenage, Ocado Group is still registered in Hatfield, and the studios at Leavesden and Borehamwood sit in the county too, whatever the London branding on the signs suggests.

The structural fact that matters most for anyone marketing here is that Hertfordshire has no single centre. Its ten districts ran from Watford at 102,300 people to Stevenage at 89,500 at the 2021 Census, with East Hertfordshire, St Albans and Dacorum all near 150,000. A business in Rickmansworth and a business in Bishop’s Stortford are not selling into the same town, are not in the same travel-to-work area, and should not be running the same page. So Hertfordshire is not really one market.

Two more things worth knowing. The county’s economic strategy for 2026 to 2036 backs defence and aerospace, life sciences, agritech, professional and business services, and film and TV, and the Airbus Launchpad in Stevenage opened in January 2026 to give smaller firms access to labs and test facilities. Second, that same strategy is honest about the soft spots: it says not all of the county’s new studio capacity is currently in use, and that major national life sciences investments have been paused. We will also tell you what we cannot. There is no published Hertfordshire-wide town centre vacancy figure, so we are not going to quote you one.