Not just a borough but a City in it's own right, this is the Small but perfectly formed economic powerhouse of London, UK and Europe. Residential housing is sparce as offices and retail outlets dominate in the (in)famous square mile. The total number of residents is actually less than 10,000 but during the day, the working population swells to over 300,000!
The City is a unique, historic place where only a few live, but many come to work in an area known as the leader in international business and finance services, not just for the UK but also for the world. It makes a hugely disproportionate impact on the national economy and has also emerged as a leading international centre for art and culture. Perhaps unsurprisingly, most of The City's residents are educated and of working age and have incomes significantly in excess of the London average.