According to a Scarborough Research report, Austin, TX (the city where I live) is the top blogging city (in the U.S.):
Austin, TX, Portland, OR, San Francisco and Seattle are the top markets for people who read or contributed to blogs.
“Not surprisingly, the cities that rank highly for bloggers are also prominent Internet-usage markets. Austin and San Francisco adults, for example, are more likely than the average to have a broadband connection at home,” said Gary Meo, senior vice president, print and digital media services. “Additionally, Austin, Portland, San Francisco and Seattle are markets with large high-tech economies.”
Demographically, bloggers are young and hail from middle class families. They are 66 percent more likely than the national average to be between the ages of 18 and 34. Fifty percent of bloggers are part of a household that has children under 17, as opposed to 41 percent of the total population. Bloggers are 20 percent more likely than the national average to have an annual household income between $50k and $100k per year.
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(Via the Austin Startup Blog)