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Does living in a area on Earth rich in rare Earth magnets provide any protection from cosmic radiation? Where is the richest areas and is there a map of these areas?

Related: How would our weather change in the event of a magnetic pole shift?

Yes, there are maps that map out variations in the earth's magnetic field, example here http://science.gc.ca/eic/site/063.nsf/eng/97358.html. The large variations are primarily due to the presence of ferric materials, ie large deposits of material like magnetite. There are no areas of rare earth magnets as far as I know, given that rare earth magnets are made from rare earth minerals artificially sintered in a very strong magnetic field suggests you will not find them naturally. Even if you did find an area the effect on cosmic radiation would be very small. The magnetic field earth is weak but very large and extends far outside our atmosphere allowing the energetic cosmic and solar particles to be trapped and or slowed. Local magnetic anomalies wouldn't have the time to influence the particles much.

If the poles shift we will have to ride out the transition as best we can. I am not aware of any major extinction event being associated with prior pole shifts, but I could be wrong. You also have to consider when the poles shift the magnetic fields that induce the current magnetic anomolies will be different or missing so you wouldn't be able to depend your chosen location being safe.

So unless you want to live underground I don't believe there are areas where the local magnetic fields will protect you from cosmic radiation.

No.

Cosmic radiation are high-energy particles that create particle showers high up in the terrestrial atmosphere. Those particle shower are heavily beamed downwards, and although in principle some secondary shower products feel the local magnetic fields, effectively are not affected by the natural terrestrial field, let alone weaker local fields.

Those showers also create hard photon radiation (X-rays) which contribute to the local background radiation and those wouldn't react to any magnetic field.

Magnetite is a type of iron ore and does not significantly affect the Earth's magnetic field. It would not protect you from cosmic radiation. However, cosmic radiation is more intense high in the atmosphere, so airline cabin crew and people living on high mountains are slightly more at risk. If you are worried about how to avoid radiation damage, the thing to watch out for is radon gas. Radon gas is released by the decay of uranium in granite rocks, and varies in different parts of Britain. In some places it can reach dangerous levels which would not be tolerated in a nuclear power station or research establishment. There are indeed maps available on the internet which show levels of radon gas throughout Britain. Cornwall is one of the high radon areas, whereas Herefordshire is a low to moderate area. Radon is invisible, tasteless and odourless, and emits high energy alpha particles (helium nuclei) to become a radioactive isotope of lead. Alpha particles are not very penetrating and can be stopped by a thin sheet of paper, but when inhaled or otherwise ingested can be very dangerous because of their ionising effect. If you live in a high radon area, it is best to keep your house well ventilated.