Using census.gov & Wikipedia as sources for world populations 1950 and before since they are equivalent and draw from the same sources.
Year | Lower Estimate | Upper Estimate |
10000 BC | 1M | 10M |
8000 BC | 5M | 5M |
6500 BC | 5M | 10M |
5000 BC | 5M | 20M |
4000 BC | 7M | 7M |
3000 BC | 14M | 14M |
2000 BC | 27M | 27M |
1000 BC | 50M | 50M |
500 BC | 100M | 100M |
400 BC | 162M | 162M |
200 BC | 150M | 231M |
1 AD | 170M | 400M |
200 AD | 190M | 256M |
400 AD | 190M | 206M |
500 AD | 190M | 206M |
600 AD | 200M | 206M |
700 AD | 207M | 210M |
800 AD | 210M | 224M |
900 AD | 226M | 240M |
1000 AD | 254M | 345M |
1100 AD | 301M | 320M |
1200 AD | 360M | 450M |
1250 AD | 400M | 416M |
1300 AD | 360M | 432M |
1340 AD | 443M | 443M |
1400 AD | 350M | 374M |
1500 AD | 425M | 540M |
1600 AD | 545M | 579M |
1650 AD | 470M | 545M |
1700 AD | 600M | 679M |
1750 AD | 629M | 961M |
1800 AD | 813M | 1,125M |
1850 AD | 1,228M | 1,402M |
1900 AD | 1,500M | 1,762M |
1910 AD | 1,750M | 1,750M |
1920 AD | 1,860M | 1,860M |
1930 AD | 2,070M | 2,070M |
1940 AD | 2,300M | 2,300M |
1950 AD | 2,400M | 2,558M |
1960 AD | 3,026M | 3,043M |
1970 AD | 3,600M | 3,713M |
1980 AD | 4,440M | 4,461M |
1990 AD | 5,289M | 5,321M |
2000 AD | 5,750M | 6,145M |
2010 AD | 6,859M | 6,916M |
wikipedia.org/wiki/Estimates_of_historical_world_population
census.gov/data/tables/time-series/demo/international-programs/historical-est-worldpop.html