PREFACE The Statistical Abstract of the United States, published annually since 1878, is the standard summary of statistics on the social, political, and economic organization of the United States. It is designed to serve as a convenient volume for statistical reference and as a guide to other statistical publications and sources. The latter function is served by the introductory text to each section, the source notes appearing below each table, the Guide to Sources, the section on Publications of Recent Censuses, and the Guide to State Statistical Abstracts. This volume includes a selection of data from many statistical publications, both governmental and private. Publications cited as sources usually contain additional statistical detail and more comprehensive discussions of definitions and concepts than can be presented here. Data not available in publications issued by the contributing agency but obtained from the agency's unpublished tabulations and records are identified in the source notes as "unpublished data." More information on the subjects covered in tables so noted may generally be obtained from the source. Except as otherwise indicated, figures are for the United States as presently constituted. Although emphasis in the Statistical Abstract is given primarily to national data, many tables present data for regions and individual States. Statistics for the Commonwealth of Puerto Rico and for outlying areas of the United States are included in the State tables whenever available and are supplemented by information in section 31. Statistics for cities or other relatively small geographic units appear only in a few instances. Additional information for cities, counties, metropolitan areas, congressional districts, and other small units, as well as more historical data, are available in various supplements to the Abstract. (See page v.) Changes in the 1972 edition.—This edition, the 93d annual issue, presents data for the most recent year or period available during the early part of 1972. Each year the more than 1,300 tables and charts are reviewed and evaluated. New tables and charts of current interest are added, continuing series are brought up to date, and less timely data are curtailed or eliminated. Text notes are revised as necessary to incorporate new definitions and source references. A new feature introduced in this edition is a loose insert, “USA Statistics in Brief, 1972," abstracted from the "Recent Trends" summary (p. xiii). Additional copies are available at 10 cents each (discount of 25 percent on orders of 100 copies or more) from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. A more comprehensive selection of statistics from the 1970 Census of Population and Housing is presented in this edition than was possible in 1971. Also, data from the 1969 Census of Agriculture are included for the first time. The availability of much new data on subjects of current interest is reflected in the largest number of new tables in many years. Although they appear separately in a number of different sections, sixteen of the new tables have in common as subjects the changing social and economic conditions of women and minority groups. Among the sections most affected by change, new tables comprise nearly one-third of the 49 tables in section 11, Income, Expenditures, and Wealth. New studies by the U.S. Bureau of Economic Analysis on business and residential capital and 1970 census results showing income characteristics of low income groups provided the bulk of the new material. Altogether there are 113 entirely new tables in this edition, scattered through 28 sections. Following are some of the subjects covered by new tables: Coastal population, p. 6 Population, by size of States, p. 11 Pupil transportation, by States, p. 126 Defendants charged with marijuana and Gross product, by industry, p. 314 Persons and families below low income Federal outlays benefiting low income Cost valuation of nonresidential and resi- Farms, by type of organization, p. 586 Export and import price indexes, p. 776 Section 33, Metropolitan Area Statistics, covering metropolitan areas with 200,000 population and over in 1970, includes additional data from the 1970 census. Of special interest are population data on such subjects as family income, education, foreign stock, Spanish heritage, and transportation to work. Reprints of this section are avail. able at 35 cents per copy (discount of 25 percent on orders of 100 copies or more) from the Superintendent of Documents, cited above. Source citations for tables provided by Federal agencies have been simplified in this edition to conform more nearly with library cataloging practices. In addition, many of the sections have undergone fairly extensive tabular rearrangement and format changes designed to improve the organization of subject matter. Of the tables included in the 1971 edition, 63 were omitted from this issue. The omissions represent primarily tables for which comparable details appear in the new or retained tables or for which no recent data are available. Responsibility.-The contents of this volume were taken from a large number of sources (see "Source Agencies and Table Numbers"). The Bureau of the Census cannot accept the responsibility for the accuracy or limitations of the data presented here, other than for those which it collects. The responsibility for selection of the material and for proper presentation, however, rests with the Bureau. SUGGESTIONS AND COMMENTS Many persons have offered suggestions for improving the presentation of data in the Statistical Abstract and its supplements. Their comments have been most helpful. Users of these publications are urged to continue to make their needs known for con. sideration in planning future editions. Suggestions and comments should be sent to the Director, Bureau of the Census, Washington, D.C. 20233. FOR ADDITIONAL INFORMATION ON DATA PRESENTED Please consult the source publications available in local libraries or write to the agencies indicated in the source notes to the tables covering the desired subject. Write to the Bureau of the Census only if it is cited as the source. Pocket Data Book, USA 1971. Graphic and tabular presentation of summary statistics on a wide variety of subjects. Designed for quick and easy reference. 352 pages. Issued 1971. Price $1.75 (paperbound). 1973 edition in preparation. Congressional District Data (Districts of the 93d Congress). Separate reports for States that revised their congressional district boundaries for the 93d Congress. Population and housing data from the 1970 census and vote cast in congressional and presidential elections, 1964-1970. Pages vary. Issued 1971-72. Each report 25¢ except California and New York, 50¢. County and City Data Book, 1967. Statistical data for each county in the United States, 224 standard metropolitan statistical areas, and 683 incorporated cities having 25,000 inhabitants or more in 1960. Information also for regions and States. Based largely on 1962 census of governments, 1963 censuses of business, manufactures, and mineral industries, 1964 census of agriculture, and 1960 censuses of population and housing. 713 pages. Issued 1967. Out of print. 1972 edition in preparation. Historical Statistics of the United States, Colonial Times to 1957. More than 8,000 series, largely annual, on social and economic development from 1610 to 1957. 801 pages. Issued 1960. Price $8.25 (clothbound). New edition in preparation. Historical Statistics of the United States, Colonial Times to 1957; Continuation to 1962 and Revisions. Carries forward the more than 6,000 series in the basic volume that are still current; includes related series and revisions and corrections. 158 pages. Issued 1965. Price $1.50 (paperbound). Directory of Non-Federal Statistics for States and Local Areas: 1969. A finding guide to sources of statistics issued by State agencies, colleges and universities, and private organizations. Specific sources shown for each State, the District of Columbia, Puerto Rico, Guam, and Virgin Islands. 686 pp. Issued 1970. Price $6.25 (paperbound). Directory of Federal Statistics for States: 1967. A finding guide to sources of Federal statistics available at the State level. Specific sources shown for hundreds of items. 380 pages. Issued 1968. Price $2.25 (paperbound). Directory of Federal Statistics for Local Areas: 1966. Similar to the directory for States, cited above, but devoted to the data available for areas below the State level. 162 pages. Issued 1966. Price $1.00 (paperbound). Order Congressional District Data reports from Bureau of the Census, Washington, D.C. 20233; other reports from Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. GUIDE TO TABULAR PRESENTATION The following symbols, used in the tables throughout this book, are explained in condensed form in footnotes to the tables where they appear: B D Represents zero or rounds to less than half the unit of measurement shown. Base figure too small to meet statistical standards for reliability of derived figure. Figure withheld to avoid disclosure of information pertaining to a specific organization or individual. NA Data not enumerated, tabulated, or otherwise available separately. NS Percent change irrelevant or insignificant. S X Figure does not meet publication standards for reasons other than that covered by symbol B, above. Figure not applicable because column heading and stub line make an entry impossible, absurd, or meaningless. Z Entry would amount to less than half the unit of measure shown. Headnotes immediately below table titles provide information important for correct interpretation or evaluation of the table as a whole or for a major segment of it. Footnotes below the bottom rule of tables give information relating to specific items or figures within the table. Unit indicators ("In thousands," "In millions of dollars," etc.) are usually given in boldface type as the first element of the head note. In tables where several units are used, the unit indicators are generally given in the stub or in the column headings. Median: The value which divides the distribution into two equal parts-one-half the cases falling below this value and one-half exceeding it. Parallel vertical rules are used to the right of a total column to indicate (1) that the components which follow add to the total (e.g., tables 1, 7, 16, etc.); (2) in the case of derived figures, that the underlying data are additive to thei total (e.g., table 16 for percentages, table 24 for ratios, table 65 for rates and table 100 for averages). Heavy vertical rules are used (1) in tables where the stub (the area, date, or descriptive column at the left) is continued into one or more additional columns across the table to separate each segment of stub and its accompanying data columns from the continued segments (e.g., tables 2, 6, 9, etc.); (2) to set off independent sections of a table (e.g., tables 1, 4, 5, etc.). In many tables, details will not add to the totals shown because of rounding. CONTENTS [Numbers following subjects are page numbers] Fig. I. Map of the United States, showing Census divisions and regions_. Health expenditures, insurance---- Fig. VII. Income compared with current expenditure per pupil_ _ Figs. VIII-IX. Median school years completed; Federal outlays for Firearms, political assassinations.. 147 Communications intercepts, lawyers. 158 Figs. X-XI. Civil disturbances; Persons charged with crimes__ . |