Population projections are estimates of the population for future dates. Projections illustrate possible courses of population change based on assumptions about future births, deaths, net international migration, and domestic migration.
api.census.gov/data/2017/popproj/pop?get=POP,YEAR&for=us:1&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2017/popproj/agegroups?get=POP,YEAR&for=us:1&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2017/popproj/nat?get=POP,YEAR&for=us:1&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2017/popproj/deaths?get=DEATHS,YEAR&for=us:1&&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2017/popproj/nim?get=NIM,YEAR&for=us:1&key=YOUR_KEY_GOES_HERE