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The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence. Cities and states, US maps and geography, U.S. Government and military, disasters, current and national events. An overview of the United States of America.

Track the spread of coronavirus in the United States with maps and updates on cases and deaths. Learn where to find answers to the most requested facts about the United States of America. Benefits, Grants, Loans. Learn about government programs that provide financial help for individuals and organizations. Consumer Issues. Learn how to be a safe consumer, what to do when a purchase or service goes wrong, and more.

The Washington Monument, as seen from the Lincoln Memorial at night.

It seems like there's always something big going on in the United States. From business to politics to culture, it can be hard to get a grip on it all. Infoplease is here to help.

The Fifty States

The map, history, capitol, flag, tree, geography, symbol of each state

U.S. Statistics

Stats on the U.S. economy, population, births and deaths, poverty, and more

U.S. Cities

Population info, weather, facts, history, and landmarks of major U.S. cities

Crime & Law Enforcement

Statistics on crime, arrests and prison population, and capital punishment in the U.S.

Education

Enrollment figures, stats on reading proficiency, SAT scores, and tuition info

Gender & Sexuality

Information about women's and gay rights, women in Congress, domestic violence, the wage gap, sexual abuse

Marriage & Household Statistics

U.S. households, marriage, divorce, adopted children, and more

Military Affairs

Weapons, casualties, summaries of U.S. and foreign wars, veteran and military personnel stats, and more

Postal Information

U.S. and international postage rates, facts about stamps, and ZIP codes

Race & Population

Population stats by race, plus data on immigration, diversity, and American Indians in the U.S.

Societies & Associations

Directory of U.S. societies and associations, from the AARP to the Zionist Organization of America

United States Coronavirus

Encyclopedia: United States Search the entire Columbia Encyclopedia for more topics.

Atlas: United States Printable U.S. Maps

Year by Year: 1900–2014 Enter a year and discover what happened!

Archives:FEATURE QUIZ TIMELINES

African Americans by the Numbers

• [Sources and more info]

Population of the United States (2020)

View live population, charts & trends: Population of the United States

Fertility in the U.S.A.

A Total Fertility Rate (TFR) of 2.1 represents the Replacement-Level Fertility: the average number of children per woman needed for each generation to exactly replace itself without needing international immigration. A value below 2.1 will cause the native population to decline

Life Expectancy in the U.S.A.

See also: Countries in the world ranked by Life Expectancy

Infant Mortality Rate and Deaths of Children under 5 Years Old in the U.S.A.

United States Urban Population

Currently, 82.5 % of the population of the U.S.A. is urban

United States Postal Service

(271,365,914 people in 2019)

Population Density

The 2019 population density in the United States is 36 people per Km² (93 people per mi²), calculated on a total land area of 9,147,420 Km2 (3,531,837 sq. miles).

Largest Cities in the U.S.A.

#	CITY NAME	POPULATION
1	New York City	8,175,133
2	Los Angeles	3,971,883
3	Chicago	2,720,546
4	Brooklyn	2,300,664
5	Houston	2,296,224
6	Queens	2,272,771
7	Philadelphia	1,567,442
8	Phoenix	1,563,025
9	Manhattan	1,487,536
10	San Antonio	1,469,845
11	San Diego	1,394,928
12	The Bronx	1,385,108
13	Dallas	1,300,092
14	San Jose	1,026,908
15	Austin	931,830
16	Jacksonville	868,031
17	San Francisco	864,816
18	Columbus	850,106
19	Fort Worth	833,319
20	Indianapolis	829,718
21	Charlotte	827,097
22	Seattle	684,451
23	Denver	682,545
24	El Paso	681,124
25	Detroit	677,116
26	Boston	667,137
27	Memphis	655,770
28	New South Memphis	641,608
29	Portland	632,309
30	Oklahoma City	631,346

United States Of America Cities

See also

Sources

• World Population Prospects: The 2019 Revision - United Nations Population Division
• World Urbanization Prospects - Population Division - United Nations

Definitions

Population Pyramid

A Population pyramid (also called 'Age-Sex Pyramid') is a graphical representation of the age and sex of a population.

Types:

• Expansive - pyramid with a wide base (larger percentage of people in younger age groups, indicating high birth rates and high fertility rates) and narrow top (high death rate and lower life expectancies). It suggests a growing population. Example: Nigera Population Pyramid
• Constrictive - pyramid with a narrow base (lower percentage of younger people, indicating declining birth rates with each succeeding age group getting smaller than the previous one). Example: United States
• Stationary - with a somewhat equal proportion of the population in each age group. The population is stable, neither increasing nor decreasing.

Stages:

Dependency Ratio

There are three types of age dependency ratio: Youth, Elderly, and Total. All three ratios are commonly multiplied by 100.
Youth Dependency Ratio
Definition: population ages 0-15 divided by the population ages 16-64.
Formula: ([Population ages 0-15] ÷ [Population ages 16-64]) × 100

Elderly dependency ratio
Definition: population ages 65-plus divided by the population ages 16-64.
Formula: ([Population ages 65-plus] ÷ [Population ages 16-64]) × 100

All The States In America

Total dependency ratio
Definition: sum of the youth and old-age ratios.
Formula: (([Population ages 0-15] + [Population ages 65-plus]) ÷ [Population ages 16-64]) × 100

Russia

NOTE: Dependency Ratio does not take into account labor force participation rates by age group. Some portion of the population counted as 'working age' may actually be unemployed or not in the labor force whereas some portion of the 'dependent' population may be employed and not necessarily economically dependent.