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While there are a small number of accounting firms whose reach spans the country, the vast majority of firms are focused on their immediate environment — the city and state they operate in, as well as nearby areas that share similar conditions. In our annual Regional Leaders report, we rank the top firms in these economic ecosystems, but not the ecosystems themselves—that’s what this slide show is for. Here, ranked by the overall growth of their top firms in 2010, are the best regions in which to run an accounting firm. (For our Regional Leaders and Top 100 Firms report, visit our Rankings section at