Census Data and US Census Data Demographic and Housing Estimates are both good sources of demographic data from the U.S. Census Bureau.
Consumer Expenditure Surveys (Bureau of Labor Statistics)
The Consumer Expenditure Survey (CE) program, which consists of two surveys, the Quarterly Interview Survey and the Diary Survey, provides information on the buying habits of American consumers. The raw data is here, along with summary reports.
Census Business Builder: Small Business Edition - 2.3 - You can view the interactive map or create a report based on your industry and business locations. Try search your town or city first, if it provides limited data, try county or state. (Instruction on how to use this website)
More New Strategist Press Publications
County Profiles - From the Maine's Center for Workforce Research and Information
Economics & Demographic - From the State of Maine Office of Policy and Management
Mainebiz: The Fact Book - Infographics about Maine business matters, from New England Business Media
Maine Statistics - From the Bureau of Economic Analysis, a division of the U.S. Department of Commerce, customizable data about Maine (and any other state, for that matter).