The population 

As of 1 January 2016, the population of United States of America (USA) was estimated to be 323,025,335 people. This is an increase of 0.75 % (2,414,202 people) compared to population of 320,611,133 the year before. In 2015 the natural increase was positive, as the number of births exceeded the number of deaths by 1,397,865. Due to external migration, the population increased by 1,016,337. The sex ratio of the total population was 0.975 (975 males per 1,000 females) which is lower than global sex ratio. The global sex ratio in the world was approximately 1,016 males to 1,000 females as of 2015. See also map of the world by sex ratio of total population.

Below are the key figures for United States of America (USA) population in 2015:

4,039,700 live births

2,641,836 deaths

Natural increase: 1,397,865 people

Net migration: 1,016,337 people

159,469,031 males as of 31 December 2015

163,556,304 females as of 31 December 2015

Reference from countrymeters.info/en/United_States_of_America_(USA)