How do the industry and occupation classifications for Census 2000 compare to the ones used in the 1990 Census?
The Census 2000 industry and occupation classifications are completely revised from the ones used in 1990. They are now based on the 1997 North American Industry Classification System (NAICS) and the 1998 Standard Occupational Classification (SOC) coding structures. The 1990 system was based on the 1987 Standard Industrial Classification Manual (SIC) and the 1980 Standard Occupational Classification Manual (SOC). To aid data users, crosswalks are available on this website for both the industry and occupation coding systems.
