Crucial to AdSense and AdWords, or any online ad platform, is the ability to target ads at just the right audience. For the US and a few European markets, the most profitable ones, advertisers can narrow down their targets quite a lot. In other places, bigger regions are used.
But Google is expanding
and localizing the targeting features in AdWords with more fine-grained controls in several countries. For example, in Canada, advertisers will be able to use ZIP codes to target ads.
In the US, Google is changing the regions made available based on Nielsen DMA, Designated Market Areas, which it believes are a more accurate representation.
In other places, Google is now finally offering city-level targeting. The new countries are: Belgium, Bulgaria where region targeting is also available now, Denmark, India, Ireland, Romania - region too, Sweden - region too, Taiwan and Vietnam.