0100-0999: Agriculture, Forestry and Fishing
1000-1499: Mining
1500-1799: Construction
2000-3999: Manufacturing
4000-4999: Transportation, Communications, Electric, Gas and Sanitary service
5000-5199: Wholesale Trade
5200-5999: Retail Trade
6000-6799: Finance, Insurance and Real Estate
7000-8999: Services
9100-9729: Public Administration
9900-9999: Nonclassifiable