of Negroes, American Indians, Japanese, Chinese, Filipinos, and all others not classified as white. Persons of Mexican birth or ancestry who are not definitely Indian or of other nonwhite stock are counted as white. Persons of mixed parentage are classified by the race or color of the nonwhite parent.

Mobility status.-Classification of the population by mobility status is based on comparison of an individual's place of residence at the survey or census date with that of a specified earlier date. Mobile persons or movers includes all persons living in different houses in the United States at the beginning and at the end of the period. According to their new location, they may be "same county movers" or "different county movers, or migrants." Migrants in turn are classified according to whether they moved within the same State or into a different State. Nonmobile persons or nonmovers includes all persons living in the same house in the United States at the beginning and end of the period. Persons abroad includes all persons living outside the United States at the beginning of the period.

Nativity. The category "Native" comprises persons born in the United States, the Commonwealth of Puerto Rico, or a possession of the United States. It also includes persons born in a foreign country or at sea who have at least one parent born in the United States. Persons whose place of birth was not reported are assumed to be native unless their census report contains contradictory information, such as an entry of a language spoken prior to coming to the United States. Persons not having any of the foregoing qualifications are classified as "foreign born."

Household.-A "household" comprises all persons who occupy a "housing unit," that is, a house, an apartment or other group of rooms, or a room that constitutes "separate living quarters." A household includes the head of the household, others in the housing unit related to the head, and also the unrelated persons, if any, such as lodgers, foster children, wards, or employees who regularly live in the house. A person living alone or a group of unrelated persons sharing the same housing unit as partners is also counted as a household. Prior to 1960 a household was defined as all the persons occupying a "dwelling unit." See text, section 28, Construction and Housing, for definitions of "housing unit" and "dwelling unit."

Group quarters are living arrangements for persons who do not live in housing units. Examples of group quarters are: A house with at least five lodgers, an institution, a college dormitory, or a military barracks.

Family. The term "family" refers to a group of two or more persons related by blood, marriage, or adoption and residing together. A primary family consists of the head of a household and all other persons in the household related to the head. A secondary family comprises two or more persons such as guests, lodgers, or resident employees and their relatives, living in a household or group quarters (other than such groups among inmates of institutions) and related to each other.

Subfamily.-A "subfamily" is a married couple with or without children, or one parent with one or more children under 18 years old, living in a household and related to, but not including, the head of the household or his wife. Members of a subfamily are also members of the primary family with whom they live. The number of subfamilies, therefore, is not included in the number of families.

Married couple.-A "married couple" is defined as a husband and his wife living together, with or without children and other relatives.

Unrelated individuals.-"Unrelated individuals" refers to persons (other than inmates of institutions) who are not living with any relatives. A primary individual is a household head living alone or with persons all of whom are unrelated to him. A secondary individual is a person in a household or group quarters such as a guest, lodger, or resident employee (excluding inmates of institutions) who is not related to the head or to any other person in the household or group quarters.

Historical statistics.—Tabular headnotes provide cross-references, where applicable, to Historical Statistics of the United States, Colonial Times to 1957. See preface.

[See table 38]

Source of figs. II and III: Dept. of Commerce, Bureau of the Census.

No. 1. AREA AND POPULATION: 1790 TO 1960

[Area figures represent area on indicated date including in some cases considerable areas not then organized or settled, and not covered by the census. Area figures have been adjusted to bring them into agreement with remeasurements made in 1940. For additional area data, see tables 5 and 250. See also Historical Statistics, Colonial Times to 1957, series A 17-21]

X Not applicable.

3,615, 211
3,615, 211
Excludes Alaska and Hawaii.

1 Revised to include adjustments for underenumeration in Southern States; unrevised number is 38,558,371. Source: Dept. of Commerce, Bureau of the Census; Reports of Fourteenth, Fifteenth, Sixteenth, Seventeenth, and Eighteenth Censuses, Population, Vol. I; and other reports and unpublished data. See also Sixteenth Census Reports, Areas of the United States, 1940.

No. 2. POPULATION: 1900 TO 1967

[In thousands. Estimates as of July 1, except as indicated. Prior to 1940, excludes Alaska and Hawaii. Estimates for 1900 to 1909 are sums of State estimates based on local data indicative of population change. See p. 1 for basis of estimates for other years. See also Historical Statistics, Colonial Times to 1957, series A 1-3]

Source: Dept. of Commerce, Bureau of the Census; Current Population Reports, Series P-25, Nos. 368 and

309.

247 - 079 O - 67 - 2

No. 3.

COMPONENTS OF CHANGE IN POPULATION: 1940 TO 1966
[In thousands, except percent. Includes Armed Forces abroad]

Includes changes due to admissions into, and discharges from, Armed Forces abroad, and "error of closure," (the amount necessary to make the components of change add to the net change between censuses), for which figures are not shown separately.

Percent of population at beginning of period. Adjusted for underregistration.

Prior to Apr. 1, 1960, adjusted for underregistration of infant deaths; includes estimates of deaths in Armed Forces abroad.

Source: Dept. of Commerce, Bureau of the Census; Current Population Reports, Series P-25, No. 331, and unpublished data.

No. 4. COMPONENTS OF CHANGE IN POPULATION BETWEEN 1960 AND 1965-STATES AND PUERTO RICO

[In thousands, except percent. Covers period April 1, 1960, to July 1, 1965. Total resident population. For explanation of methodology, see source. Minus sign (-) denotes decrease. See also Historical Statistics, Colonial Times to 1957, series C 25-73]

Z Less than 500 or 0.05 percent. 1 Base is 1960 total population. 2 Comprises both net immigration from abroad and net interdivisional or interstate migration according to the area shown. Includes movements of persons in the Armed Forces.

Source: Dept. of Commerce, Bureau of the Census; Current Population Reports, Series P-25, Nos. 348 and 358.

No. 5.

POPULATION AND AREA-UNITED STATES AND OUTLYING AREAS: 1940 to 1960 [For area figures of individual States, see table 252. See also Historical Statistics, Colonial Times to 1957, series A 4-16 and J 2]

Z Less than 0.5 square mile.

Civilian citi ens employed by the U.S. Government..

Families of Armed Forces personnel or of civilian

citizen employees...

Crews of merchant vessels.

Other citizens.

NA Not available.

X Not applicable.

1 Includes estimated population of the Philippines (16,356,000), not shown separately. Census taken as of Oct. 1, 1939.

Puerto Rico was ceded to the United States by Spain in 1898. On July 25, 1952, pursuant to acts of Congress, it achieved the political status of the Commonwealth of Puerto Rico.

Not enumerated.

Enderbury Island uninhabited at time of enumeration.
Sand Island uninhabited at time of enumeration.

"Little Swan Island uninhabited at time of enumeration.

Includes Caroline, Christmas, Danger (Pukapuka), Flint, Funafuti, Kingman Reef, Malden, Manabiki, Navassa, Nukufetau, Nukulailai, Nurakita, Palmyra, Penrhyn, Rakabanga, Starbuck, Vostok, Phoenix Group (except Canton and Enderbury), and Union (Tokelau) Group, not enumerated in decennial censuses; and Baker, Howland, and Jarvis Islands not inhabited in 1950 and 1960. Quita Sueño Bank, Roncador Cay, and Serrana Bank, claimed by both the United States and Colombia, not enumerated.

Population of Baker, Howland, and Jarvis Islands. Other islands not enumerated or uninhabited at time of enumeration.

1 Not enumerated or uninhabited at time of enumeration.

11 Area is for Navassa (2square miles), Baker, Howland, and Jarvis (combined area 3 square miles), and Palmyra (4 square miles). Excludes Kingman Reef, Quita Sueño Bank, Roncador Cay, and Serrana Bank (each less than 0.5 square mile); area of other islands listed in footnote 8 not available.

Under jurisdiction of United States in accordance with treaty of Nov. 18, 1903, with Republic of Panama. 13 Leased (1914) from the Republic of Nicaragua for 99 years.

14 Figures from Government of Nicaragua. Little Corn Island uninhabited at time of enumeration.

"Under the United Nations Trusteeship System with the United States as administering authority since July 18, 1947.

Population 1940, 131,258 (Census of Japan).

Estimated civilian population as of June 30, 1950; see Current Population Reports, Series P-25, No. 238, for derivation of estimates.

1 Census of 1958 conducted by the Office of the High Commissioner. Civilian population; see Census Report, 1958: Trust Territory of the Pacific Islands, Office of the High Commissioner, Agana, Guam, June 1959.

See references in footnotes 17 and 18, above. Comprised of 687 square miles of land area and 7,797 square miles of water area,

Excludes United States citizens temporarily abroad on private business, travel, etc. Such persons were enumerated at their usual place of residence in the United States as absent members of households. Excludes dependents of Federal employees and crews of merchant vessels.

Based on 20-percent sample of reports received.

"Represents U.S. citizens abroad for extended periods of time. Since this population was enumerated on a voluntary basis, its coverage is probably less complete than that of other categories of Americans abroad.

Source: Dept. of Commerce, Bureau of the Census; U.S. Census of Population: 1960, Vol. I.