Prime Minister Boris Johnson implemented plans to offer a third vaccine to all adults by the end of the month.
Some medical appointments are set to be postponed to focus on the booster rollout.
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Statistics from NHS England and The Office for National Statistics estimate the proportion of residents over 40 with a booster jab.
The data is split between local authority, and the percentage of the population with a third jab varies across Hampshire.
Here are the local authorities in Hampshire with the highest proportion of people with a third dose.
Click through all the pages to find out which area has the most.
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![In Southampton, 56,210 people over the age of 40 have had a third vaccination. This is estimated to be 56.2 per cent of the local authority population.](https://www.thestar.co.uk/webimg/b25lY21zOmYyZGMyODkxLWJiY2UtNGFmYS04YzE3LWRmMDBmMThhMDM3MDo2OWU3ODA3MS1hNjc0LTRlMjUtYTRjNS01YjRjMzE4YTY3YzA=.jpg?crop=3:2&width=640)
1. Southampton
In Southampton, 56,210 people over the age of 40 have had a third vaccination. This is estimated to be 56.2 per cent of the local authority population. Photo: Google Street View
![In Portsmouth, 53,536 people over the age of 40 have had a third vaccination. This is estimated to be 59 per cent of the local authority population.](https://www.thestar.co.uk/webimg/b25lY21zOmJkNzkyOTQwLTk1MTYtNDgwNS04YjY1LTc0MDlkZGY4MWNjMTpmNWYyOGI4Yi0zNjMxLTQ3NzAtYmYyMi05MDhlYjJiMmI4MDA=.jpg?crop=3:2&width=640)
2. Portsmouth
In Portsmouth, 53,536 people over the age of 40 have had a third vaccination. This is estimated to be 59 per cent of the local authority population. Photo: Chris Moorhouse
![In Basingstoke and Deane, 54,841 people over the age of 40 have had a third vaccination. This is estimated to be 59.4 per cent of the local authority population.](https://www.thestar.co.uk/webimg/b25lY21zOjcyNjViN2NjLTlmNzktNGI5Mi1hN2QwLTUyNTQ0ODRiMmZlYzo2N2YwNzNkMi02MDc1LTRmM2QtYjc5Ni0yZGNkMDhiOGFkMzU=.jpg?crop=3:2&width=640)
3. Basingstoke and Deane
In Basingstoke and Deane, 54,841 people over the age of 40 have had a third vaccination. This is estimated to be 59.4 per cent of the local authority population. Photo: Andrew Matthews - WPA Pool/Getty Images
![In Eastleigh, 43,726 people over the age of 40 have had a third vaccination. This is estimated to be 61.1 per cent of the local authority population.](https://www.thestar.co.uk/webimg/b25lY21zOmYwMWEyMTlkLWFiNmItNGE3NC1iODVkLWZkMzdkMzBmOGIyZDpiMTJlM2EzNy00ZDQzLTQ1MzUtYTk1Ny0xM2U3MzVjODk4NjI=.jpg?crop=3:2&width=640)
4. Eastleigh
In Eastleigh, 43,726 people over the age of 40 have had a third vaccination. This is estimated to be 61.1 per cent of the local authority population. Photo: Google Street View