Guess US city populations via bracket-style game

Test your gerrymandering skills with this interactive game

This simulation demonstrates how packing and cracking alter election outcomes. See how shifting district lines can change representation—regardless of the overall makeup of the electorate.

Ranking America's healthiest and unhealthiest cities

Compiling data from the 180 most populated cities in the US, WalletHub evaluated which of those metros are the healthiest using 43 health indicators, from the average cost of a medical visit to total vaccination rates.

Visualizing the world's population centers

What does population density look like on a global scale? These detailed 3D renders illustrate our biggest urban areas and highlight population trends.

How March Madness bracketology became a national obsession

An estimated 60 million people fill out March Madness brackets yearly, despite a one in 9.2 quintillion chance of filling it out perfectly. This Smithsonian magazine article explores how UCLA's dominance in the 1960s and '70s made brackets boring and predictable, and how the expansion to 64 teams and putting games on TV played a huge role in popularizing March Madness brackets.

Explore detailed US census data for each state

QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more, collected through the US census. Interactive tables, maps, and charts synthesize census data. A drop-down menu allows users to...

An AI-built pixel map reimagines New York City as a video game

Isometric NYC is a zoomable pixel-art map that renders the city in game-style perspective (think SimCity), helpfully clarifying the dense geography and architecture. The makers built the project tile-by-tile using satellite data and generative AI. Zoom into building-level views or out to see all five boroughs.

How demographics influence voter turnout and elections

This article breaks down demographic data to show what it means for American elections. According to the latest US Census, the US is growing increasingly diverse. As the population becomes more diverse, so does the electorate. Analyzing the...

Compare the true size of any country

This interactive lets you drag any country across the conventional Mercator projection to compare its true size to others. Africa, which appears similar in size to Greenland on standard maps, is actually close to 15 times larger. It's a great way to recalibrate your assumptions about world geography.

US state economies compared to entire countries

This map compares US state economies by their gross domestic product to that of a similarly sized country. For instance, California has the largest state economy in the US, with a GDP nearly equal to that of India, the fifth-largest economy in the world. Click here to see how the rest of the states compare.

Calculate whether or not you're in the American middle class

In 2022, roughly 52% of US adults lived in middle-income households. This income calculator can help you determine whether or not you're one of them. Specifically, the calculator lets you enter your household income, location, and more to see where you line up in Pew's government data.

Cities bore the brunt of the migrant surge in the 2020s

During the 2022-24 migration surge, cities such as New York, Chicago, and Denver faced shelter overcrowding, strained public services, and housing shortages—while the upfront costs fell almost entirely to states and cities.

Search this digital archive of 19th-century "panoramic" maps of US and Canadian cities

The panoramic map was a popular cartographic form used to depict U.S. and Canadian cities and towns during the late nineteenth and early twentieth centuries. You can peruse a gallery of almost 2,000 of them in this digital archive from the Library...

Can you pass the US Civics quiz?

To become a naturalized US citizen, you must answer 10 questions out of a pool of 100, with at least six being correct in order to pass. It's commonly said that many natural-born American citizens would likely not do so well on the test. To get a sense of the questions asked, challenge yourself with 10 civics questions with this fun quiz from the AP to see how you'd do on the all-important naturalization test.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

See MS prevalence by region in the United States

This map underscores that people in the northeastern United States have more cases of the disease as compared to the south, west, and midwest. On an individual level, these numbers may still differ based on genetic makeup and other factors irrespective of where people live.

Calculate how much of your tax dollars go to each federal program based on your income, filing status, and number of children

NOAA's interactive sea level rise viewer

How will rising seas affect you? Launch NOAA's sea level rise viewer and zoom in on impacts to different parts of the United States, or type in your city or address to learn more.

US marshals conducted the national census for nearly a century

From 1790 to 1870, US marshals handled the national census, gathering population data from every district. The responsibility was gradually transferred to a separate federal office that would officially become the Census Bureau in 1902.

Mapping Claude's relative usage worldwide, led by Israel, Singapore, and the US

According to Anthropic's AI Usage Index, the US leads in total users, but Israel and Singapore have higher adoption rates among their working populations. Excluding nations with insufficient numbers of conversations for analysis, Tanzania and Angola rank last in the index.

View hourly electricity demand and generation across the continental US

This dashboard maps data from the high-voltage bulk electric power grid based on information from regional electricity balancing authorities. Users can also chart data for up to the past 31 days to observe how forecasted demand compares with actual demand and generation.

Measuring which nation has the most baseball fans

It's known as America's pastime, but just how devoted are Americans to baseball? FiveThirtyEight outlines several metrics indicating Puerto Rico may have the most devoted fanbase. See how they used an adjusted metric to rank the world's biggest...

Six Degrees of Wikipedia, where any two articles connect in six clicks or fewer

Enter any two topics (or use suggestions) and find the shortest path of links between them. The game playfully illustrates the vast interconnections of human knowledge.

Determine your carbon footprint with this web tool

This tool from the Environmental Protection Agency calculates a user's carbon footprint based on their zip code, household size, and emission factors involving home energy, transportation, and water production.

Learn how tax brackets actually work

The US has a series of tax brackets which grow progressively larger based on the amount of income a taxpayer makes. Contrary to common belief, most people don't pay just one tax bracket, but all of them progressively until they reach their income.

A Native American city in present-day Illinois once rivaled the size of medieval London

Around 1100, the city of Cahokia, the largest Mississippian settlement, reached a population of 15,000 to 20,000. Located across the Mississippi River from present-day St. Louis, it featured massive earthen pyramids and a central plaza the size of 35 football fields.

How congestion pricing is trying to fix downtowns

Billions of gallons of gas are wasted each year as US drivers sit in traffic losing billions of hours of time. The congestion problems big downtowns face has led to innovative interventions to try to stop the traffic, including congestion pricing, a...

Try counting like the Maya in this interactive math game

The Maya numerical system used dots for 1, bars for 5, and a shell symbol for zero. This interactive resource lets users practice counting with the Maya base-20 system using the same symbols once common in the Yucatán.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Play the role of a student in a game where you try to navigate college and remain debt-free, selecting different income levels, high school experience, race, ethnicity, and more.

See how each of the more than two million known species relates to each other—and to common ancestors—in this zoomable tree of life.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

View the ten deadliest tornadoes in US history.

Exploring the Larry Bird punch that almost changed March Madness

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

This poison ivy knowledge quiz—accompanied by photos of the plant's varied forms—may help you identify this common rash-inducing growth.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

The 2026 Ebola outbreak in the DRC is spurring new Ebola vaccine development for the Bundibugyo species.