Work with interactive mapping tools from across the Census Bureau.
Collection of audio features and sound bites.
The Census Bureau packages data and information into easy-to-understand visuals.
Browse Census Bureau images.
Read briefs and reports from Census Bureau experts.
Watch Census Bureau vignettes, testimonials, and video files.
Read research analyses from Census Bureau experts.
Developer portal to access services and documentation for the Census Bureau's APIs.
Explore Census Bureau data on your mobile device with interactive tools.
Find a multitude of DVDs, CDs and publications in print by topic.
These external sites provide more data.
Download extraction tools to help you get the in-depth data you need.
Explore Census data with interactive visualizations covering a broad range of topics.
How we provide the best mix of timeliness, relevancy, quality, and cost for the data we collect.
Learn about other opportunities to collaborate with us.
Explore the rich historical background of an organization with roots almost as old as the nation.
Explore prospective positions available at the Census Bureau.
Information about the current field vacancies available at the U.S. Census Bureau Regional Offices.
Discover the latest in Census Bureau data releases, reports, and events.
The Census Bureau's Director writes on how we measure America's people, places and economy.
Find interesting and quirky statistics regarding national celebrations and major events.
Listen to audio files on fun facts, historical figures, and celebrations of the month.
Find media toolkits, advisories, and all the latest Census news.
See what's coming up in releases and reports.
The U.S. Census Bureau's population clock does not magically subtract who has died or left the country in the last minute nor does the agency get a call from the hospital every time a baby is born. Instead the population clock ticks off the resident count based on the monthly national population estimates, and the Census Bureau assumes daily population change is constant. This includes the rates of births, deaths, international migration and Armed Forces movement. Growth rates for each month take into consideration changes in each. For example, death rates in the winter months are slightly higher than the death rates at other times of the year.
To produce the national population estimates, the Census Bureau uses a demographic accounting method. First, the Census Bureau adds the number of children who were born and subtracts the number of people who have died since the last census. This information is provided by the National Center for Health Statistics and includes other information such as race and place of birth. The estimates also take into account the number of people moving in and out of the United States such as international migrants, people in the military and U.S. residents moving abroad. The Census Bureau uses the American Community Survey to measure international migration and the various branches of the military, and the Department of Defense provides information on the movement of the military population.
The population estimates do not include tourists or other people visiting the United States for just a short time, people stationed overseas or U.S. citizens who live abroad.
For more information about the Census Bureau's methodology for producing the national estimates used to update the U.S. population clock, visit the Population and Housing Estimates website.