New York - Amazon.com Inc. says it is adding 7,000 jobs in 13 states, beefing up staff at the warehouses where it fills orders, and in its customer service division.

The company says it will add 5,000 full-time jobs at its U.S. distribution centers, which employ about 20,000 workers who pack and ship customer orders.

The world's largest online retailer has been spending heavily on order fulfillment, a strategy meant to help the business grow, but one that has also weighed on profit margins. The company said last week that it lost money in the second quarter, even as revenue increased.

Distribution center jobs are available in Phoenix; Middletown, Del.; Patterson, San Bernardino and Tracy, Calif.; Indianapolis and Jeffersonville, Ind.; Hebron, Ky.; Breinigsville, Pa.; Charleston and Spartanburg, S.C.; Chattanooga and Murfreesboro, Tenn.; Coppell, Haslet and San Antonio, Texas and Chester, Va.

President Barack Obama is scheduled to visit the Chattanooga facility today, according to the White House.

The company is also adding 2,000 jobs in customer service, including full-time, part-time and seasonal. Jobs are available in Winchester, Ky.; Grand Forks, N.D.; Kennewick, Wash. and Huntington, W.Va. Work-from-home positions are available in Oregon, Washington and Arizona.