The Associated Press shows 304 American service members had died as of Dec. 30, up from 151 in 2008. The count does not include eight U.S. civilians killed by a suicide bomber on a base in eastern Afghanistan on Wednesday.
Also, the annual death toll of international troops, including U.S. forces, surpassed 500 for the first time in the war. The total this year was 502 compared with 286 in 2008, according to the AP count.
Among other forces, Britain took the worst blow in 2009 with 107 deaths and Canada lost 32, including four who died Wednesday when their vehicle was blown up by a roadside bomb.
Other countries in the international military operation lost a total of 59 service members.
U.S. military officials acknowledge that the insurgency has the momentum and that more troops on the battlefield means the death toll is likely to remain high in the near term. Another 30,000 reinforcements are due in coming months, raising the American presence to 100,000.