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Non-geotargeted domains attracted a higher percentage of non-U.S. traffic than I expected in many cases. However, US localization of traffic for U.S. geotargetted domains was, in many cases, 100%.
Since there are many countries where English is spoken it's not surprising to find significant non-U.S. traffic for generic English word domains. Also, a number of the non-geo domains likely attract international traffic from non-English speaking nations since the domains relate to international trade/commerce.
Localized domains - such as ExampleCounty.com or ExampleCountyWidgets.com - effectively draw highly targeted, localized type-in traffic. Pure type-in, undeveloped website traffic.
FYI: I did a little exploring today. Many geotargeted domains are taken but there are a number of domains in this realm still available. A friend who is a realtor followed my advice several years ago. She appears quite happy with the results. Since a single commission might run $10-20,000+ I can understand why she keeps renewing the domains.
So, if you have a brick and mortar presence and wish to attract local traffic you may wish to geotarget your domain.
IF a sales lead is worth more than the domain/hosting cost having a second or third website may be a wise investment as the world moves ahead in its use of the WWW.
IF this doesn't work in your case then the investment/loss will be rather small.
My advice: Get 'em whilst you can, if you can. It's not only search engine technology that allows you to localize your traffic.
Also, it seems people get so frustrated looking for local suppliers that they end up searching for 'local service' (using the word local rather than a locality coupled with the actual service). So for a national company it can make sense to get that localservice.com name (if available)
As for ExampleCountyWidgets.com, they can also help slightly from an SEO point of view. You also have the option of link exchange with people from the corresponding county in other states. I think there are 3000ish counties in the US and many, many crossovers.