With the release of WoL Blizzard posted profiles of some of the planets within and near Korpulu Sector. Most of these planets are Terran worlds. From the profiles and SC2 itself weknow more about population of some of these worlds by the time of SC2 events. Korhal (after its restoration) has around 6.3 billion people on it, Umoja has ~2.1 billion and Moria has ~4.1 billion. We also know that several billion Terrans live on other Koprulu worlds.
By the latter part of Second Great War in SC2 about 8 billion people were killed by the Kerrigan's Zerg, most of them during the Second War. Many of the Sector's original (i.e. prior to the first invasion) population were also killed in the Great War in SC. So, what is the estimted number of Terrans living on all Confederacy/Dominion, Kel-Morian and Umojan planets? My rough count is about 20 billion. This is a pretty big number, but it is, in fact, fairly logical, since in the first decades of colonization of the first three and other planets there could very well be a major population growth, triggered by various technological and social factors, escpecially since the time when the three original colonies finally contacted. And the Terrans were colonizing the sector for about 240 years by time SC began. The Koprulu Sector population can be numbered in couple of tens of billions.
So, what do you think about Terran population? Is my estimation fairly correct?