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If you change your domain then expect your rankings and traffic to drop significantly for at least a short period of time (a few months is likely). You'll need to set up 301 redirects from the old domain to the new, pointing to relevant replacement URLs on the new domain; .us/how-to-redirect => .com/how-to-redirect The .us domain will help focus on a US market, though a .com will also do the same. The differences is a .com is also international, so users from the UK, France, etc may still feel comfortable dealing with a .com domain, but may not with a .us one. The most important thing in terms of SEO is the users' experience in finding the answer to their query; too many people focus on using '-' in their URL in order to get the perfect, keyword rich domain, but Google actually looks for the speed and efficiency in which you can answer a query for "easier routes from IL to KY". .com, .net, .org. They're all pretty much the same in terms of value; they're all TLDs. The key difference in them is how your users react to them; a charity/public service website may see better results by using a .org for example, but a multinational corporation would likely only settle for .com or .net.