The Census of Population and Housing, from the Census Bureau, gathers personal and household characteristics on a nation-wide basis every ten years.
Clickable maps make it easy.
From Oregon State University. 1990 U.S. Census Lookup Full Record From the US Census Bureau. 1992 Census of Transportation, Communications, and Utilities Full Record From the U.S. Bureau of the Census. The Economic Census, from the Census Bureau, offers extensive data, as well as narrative summaries, for most sectors of the United States economy in 1992. Even allows searches by ZIP code.