Do abbreviations or alternate spellings count?

Yes. Most quizzes allow common abbreviations, alternate spellings, and short forms. Try typing just the first few letters — if it matches, it will autofill.

North America

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US Circle Population Selection Challenge

Directions

The object of this quiz is to click on the circle containing the largest population. When you begin you’ll be shown 2 circles on the map with radii between 10 and 250 miles which do not intersect. Click on the one with the larger population within it (based on US census tract info) then ‘Submit’ – if you are correct you’ll move on. One incorrect round and the quiz is over. Every 5 rounds the number of circles on the map will increase by 1. Try to build the longest streak of correct circles. Circles displayed will always be non-intersecting.

NOTE: You may have to zoom out to see all circles, occasionally a AK/HI circle will be included. Also, only population within the US is included in the total, any Canada/Mexico coverage counts as 0 population within the circle.

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Quiz Takers

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Canada Circle Radius Population Challenge

The object of this quiz is to adjust each circle's radius so it contains the target population shown at the right. When you click Start you will be shown a marker on a random Canada dissemination area (there are over 55K dissemination areas across Canada, the smallest census tabulation area). Also you will see an adjustable circle of radius 100 km to start. Adjust the circle's radius by dragging it until it contains the target number of people shown - this target will be between 10K and 5 million people. Then click submit. You are scored on how close your circle's population is to the target. Circle population is tallied by totaling all output areas within that circle.

US Circle Radius Population Challenge

The object of this quiz is to adjust each circle's radius so it contains the target population shown at the right. When you click Start you will be shown a marker on a random US census tract (there are over 80K census tracts in the US). Also you will see an adjustable circle of radius 100 miles to start. Adjust the circle's radius by dragging it until it contains the target number of people shown - this target will be between 100K and 25 million people. Then click submit. You are scored on how close your circle's population is to the target. Circle population is tallied by totaling all census tracts (small census areas of average 4K population) within that circle.

NOTE - population in Canada and Mexico is NOT counted at all, only US population within the circle.

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US City Grid Blackout – Choose State

First choose a state by typing its abbreviation. A grid will then be placed over the state, larger states will generally have larger grid squares. Then, name any city from your chosen state in each grid square which fits the category label for each square. AK and HI are not included on this quiz, they often have just one option per square.

LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 50-100K) means the city has that range for its population.
2+ WORDS means the city name has 2 or more words (words denoted by a space or hyphen).

At the end of the quiz the largest population missed answer will show in each square.

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