The four-week moving average for new claims, which irons out week-to-week volatility, increased 13,250 to 343,500.
Claims data continue to be plagued by seasonal volatility. Other labor market indicators have pointed to a strengthening in job growth.
The Federal Reserve on Wednesday said it viewed the risks to the outlook for the economy and the labor market as "having become more nearly balanced."
(Read more: Fed to taper bond buying by $10 billion a month)
The U.S. central bank announced it would reduce its monthly $85 billion bond buying program by $10 billion starting in January.
Last week's claims data covered the period for the December nonfarm payrolls survey. Claims increased 53,000 between the November and December survey periods, but seasonal volatility reduces their usefulness in trying to predict payroll growth.
Payrolls increased solidly in October and November. The unemployment rate dropped to a five-year low of 7.0 percent in November.
A Labor Department analyst said no states had been estimated, but noted that claims were still in a period of volatility related to the holidays.
The claims report showed the number of people still receiving benefits under regular state programs after an initial week of aid rose 94,000 to 2.88 million in the week ended Dec. 7.