U.S. Census Bureau
2002 Economic Census main page

Economic Census:
Concentration Ratios


The following data are from the Economic Census.  All of these reports classify industries by the percent of output accounted for by the largest 4, 8, 20 and 50 companies.  Only the manufacturing reports include the Herfindahl-Hirschman Index.  Data for 2002 and 1997 are organized and classified by the North American Industry Classification System (NAICS).  Data for 1992 and prior years are organized and classified by the Standard Industry Classification (SIC) system.

2002 and 1997 Economic Censuses, by NAICS

With the exception of data for manufacturing, these data are from Table 6 in reports entitled Establishment and Firm Size. These tables are also available in manipulable form on DVD-ROM (2002) or CD-ROM (1997) and in American FactFinder.
NAICS Sector title 2002 Economic Census 1997 Economic Census
Link to PDF Link to FactFinder Link to PDF Link to FactFinder
21 Mining No concentration data available
22 Utilities link to pdf link to American FactFinder link to pdf link to American FactFinder
23 Construction (none available) No concentration data available
31-33 Manufacturing link to pdf Choose Value of Shipments or
Value Added
 link to pdf Choose Value of Shipments or
Value added
42 Wholesale Trade link to pdf link to American FactFinder link to pdf link to American FactFinder
44-45 Retail Trade link to pdf link to American FactFinder link to pdf link to American FactFinder
48-49 Transportation and Warehousing link to pdf link to American FactFinder link to pdf link to American FactFinder
51 Information link to pdf link to American FactFinder link to pdf link to American FactFinder
52 Finance and Insurance link to pdf link to American FactFinder link to pdf link to American FactFinder
53 Real Estate and Rental and Leasing link to pdf link to American FactFinder link to pdf link to American FactFinder
54 Professional, Scientific, and Technical Services link to pdf link to American FactFinder link to pdf link to American FactFinder
55 Management of Companies and Enterprises (none available) No concentration data available
56 Administrative and Support and Waste Management and Remediation Services link to pdf link to American FactFinder link to pdf link to American FactFinder
61 Educational Services link to pdf link to American FactFinder link to pdf link to American FactFinder
62 Health Care and Social Assistance link to pdf link to American FactFinder link to pdf link to American FactFinder
71 Arts, Entertainment and Recreation link to pdf link to American FactFinder link to pdf link to American FactFinder
72 Accommodation and Foodservices link to pdf link to American FactFinder link to pdf link to American FactFinder
81 Other Services (except Public Administration) link to pdf link to American FactFinder link to pdf link to American FactFinder

1992 Economic Census, by SIC
 

Report # Sector title Link to PDF or text

MC92-S-2

Concentration Ratios in Manufacturing

ASCII text

The following are extracted from "1992 Economic Census Establishment and Firm Size" reports.

FC92-S-1

1992 Census of Financial, Insurance and Real Estate Industries (1 Mb)

link to pdf

RC92-S-1

1992 Census of Retail Trade(.9 Mb)

link to pdf

SC92-S-1

1992 Census of Service Industries (4 Mb)

link to pdf

UC92-S-1

1992 Census of Transportation, Communications, and Utilities (2 Mb)

link to pdf

WC92-S-1

1992 Census of Wholesale Trade (4 Mb)

link to pdf

Concentration data are not available for mining and construction.

1987 and Earlier Years

Manufacturing. This spreadsheet [xls], adapted from a file originally published on the 1992 Economic Census CD-ROM, contains data for Concentration Ratios in Manufacturing for each particular SIC-based industry back as far as the time series is unaffected by definitional changes, in some cases to 1947. Data for 1982 and earlier years for those SICs that changed in 1987 are available only in Concentration Ratios reports that may still be retained at major libraries.

Retail Trade, Wholesale Trade, and Service Industries. The 1987 Economic Census CD-ROM 1E includes a file for each of these three sectors with concentration data for 1987 only. Data for earlier years are available only in printed reports that may still be retained at major libraries.

To order CD-ROMs, see http://www.census.gov/mp/www/cat/business_and_industry.

Source: U.S. Census Bureau, Economic Census