The most difficult pop­u­la­tion riddles

Non-citizens in Latvian law are individuals who are not citizens of Latvia or any other country, but who, in accordance with the Latvian law "Regarding the status of citizens of the former USSR who possess neither Latvian nor other citizenship", have the right to a non-citizen passport issued by the Latvian government as well as other specific rights. Approximately two thirds of them are ethnic Russians, followed by Belarusians, Ukrainians, Poles, and Lithuanians.

About 19,731,984 people live in Australia on an area of 7,686,550, which gives 2.6 people per km². Next is Canada 3.3, Russia 8.5 and Saudi Arabia 12 people.

The largest city in Europe is Istanbul, Turkey, with a population of 14.7 million people. After Turkey comes Moscow, Russia, followed by Paris France. All of the numbers cited come from the United Nations' Population Division.

Estimates vary depending on source, though available data suggest a total number of around 60 million people worldwide (with roughly 21 million living outside of Poland, many of whom are not of Polish ethnicity, but Polish nationals). There are almost 38 million Poles in Poland alone.

Texas is the largest of the 48 contiguous US states and sits in the South Central part of the country along the US-Mexico border. It's currently estimated that the population of Texas in 2018 is 28.70 million, up substantially from 25.1 million in 2010. This is due to its current growth rate of 1.80%, which ranks 3rd in the country.

Both California and Poland have a population of 38M. Of these two, Poland is more densely populated.

Most African countries have the annual population growth rate in excess of 2%. In addition, there is a high proportion of younger people within the Africa population as a whole, with reports that 41% of the African population are under the age of 15. The population of Africa is currently projected to quadruple in just 90 years, with a growth rate that will make Africa more important than ever to the global economy.

If we could shrink the earth's population to a village of precisely 100 people, with all the existing human ratios remaining the same, it would look something like the following • 60 Asians • 12 Europeans • 13Africans • 9 Latin Americans/Caribbeans • 5 North Americans • 1 Oceanian