The population of the US is scheduled to officially hit 300 million at 7:46 a.m. (EDT) (1146 GMT) Tuesday, when the Census Bureau's population clock rolls over to the big number.
But don't expect wild celebrations, fireworks or any other government-sponsored events to mark the milestone. Why bother? Many experts think the population actually hit 300 million months ago.
"I don't think anybody believes it will be the precise moment when the population hits 300 million," said Howard Hogan, the Census Bureau's associate director for demographic programs. But, he added, "We're confident that we're somewhat close."