What city is called the insurance capital of the world?

Hartford, Connecticut.

Can't disagree with Tabby - Hartford so called because of the high percentage of population employed in the industry, but, traditionally London has been so known too (the LIM or London Insurance Market being the world's biggest) and I believe I've seen it ascribed to Bermuda too (although that's not a city)

DesMoines, Iowa is the insurance capital of the world. at one time it was Hartford CT.

Due to economics and business practices the financial feasability of keeping the capital in Hartford, CT failed all expectaions.

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Des Moines has been able to attract a huge insurance industry base; it's known as the third insurance capital of the world, after Hartford, Conn., and London. Despite its location in what some East Coasters call "the flyover zone," the state capital has kept up with trends in technology. Its tech savvy was underscored in December, when the Center for Digital Government awarded Des Moines the first-place prize for midsize cities in its survey on the use of technology by city government.
http://www.findarticles.com/p/articles/mi_m0DIZ/is_16_15/ai_100385232


[Added reference - McG]

What about Bloomington, Illinois? A large percentage of the population works in insurance, especially State Farm, which has its corporate offices and regional offices there. Also Country Companies has headquarters there.

Bermuda!?
http://www.findarticles.com/p/articles/mi_m0BJK/is_2_13/ai_83373393


http://www.bermuda-insurance.org/

It's a traditional nickname of London, because of the location there of Lloyds, which may not be the first insurance establishment (could be, not looked it up) but is the name associated with insurance in most minds for the longest time.