The 20 most populated settlements of the county of Hertfordshire, with district centres in yellow, and key towns and areas shown in white.
. The county town is in bold.
This is a list of settlements in Hertfordshire ordered by population based on the results of the 2001 and 2011 censuses. In 2011 there were 35 settlements with 5,000 or more inhabitants in Hertfordshire. The next United Kingdom census will take place in 2021.