Scotland is the most northerly part of the island of Great Britain. Apart from its towns and cities it has a very low population density.https://en.wikipedia.org/wiki/Demography_of_Scotland#/media/File:Population_density_map_in_Scotland_from_the_2011_census.png
The population density of United States Virgin Islands is 354 people per square kilometer.
Northern Hungary's population density is 90 people per square kilometer.
Northern Cyprus's population density is 86 people per square kilometer.
The population density of Northern Bruce Peninsula is 4.8 people per square kilometer.
Northern Borders Province's population density is 2.87 people per square kilometer.
England has 383 people per kilometre 637 per square mile - or - It depends, some places under 100 people, some places 100 - 500 people, and other places over 500 people! The question is about the UK - not England.
There are 133 people per square kilometer. (2008 estimate)
The square kilometer of livestock would feed more people, but it would require more energy to obtain.
England's population density is 395 per square kilometer.
5,335 per square kilometer or 13,817.6 per square mile...
1,425 people per square kilometer in Cape Town
Trondheim's population density is 539.1 people per square kilometer.