TRACY -- Amazon said Tuesday it will employ hundreds of full-time workers at a new million-square-foot distribution center it will develop in Tracy, part of its quest to provide next-day and same-day deliveries.

"It's great to be getting these jobs," said Michael Ammann, CEO of the San Joaquin Partnership. "This is going to be a state-of-the-art facility. It is not just going to be a few people with forklifts in a warehouse. It is going to be a very sophisticated operation for Amazon."

Potentially 500 or more full-time Amazon employees could work at the Tracy site.

Amazon in late 2012 opened a center to fill customer's orders in San Bernardino. And in the Stanislaus County city of Patterson, Amazon is building a distribution center that could employ 350 to 400, according to estimates from the governor's office and the city of Patterson.

"Amazon is going to provide a huge economic boost for our region," Patterson City Manager Rod Butler said. "The facility they are building in Patterson will make use of advanced robotics."

The order-filling centers are all part of Amazon's efforts to provide next-day and same-day delivery for customers, analysts said.

"It's for people who want instant gratification," said Rob Enderle, a San Jose-based analyst.

With the centers in operation, Amazon could pose more challenges to brick-and-mortar retailers.

"It will be tougher for stores to compete with the idea of a customer picking up the phone or using their computer, placing an order and paying a nominal fee to get same-day delivery," Enderle said. "You don't have to deal with crowds or traffic."

The time frame for construction of Amazon's Tracy complex is unknown. Patterson officials expect the distribution center in their community to be completed by this fall.

"We are excited to be growing in the state and to be creating hundreds of full-time positions in Tracy," Mike Roth, vice president of Amazon's North American operations, said in a statement.

Jobs at Amazon's distribution centers pay on average 30 percent more than traditional retail jobs, the online retailer said.

Contact George Avalos at 408-373-3556 or 925-977-8477. Follow him at Twitter.com/george_avalos.