Thursday is deadline day for more than a dozen communities from across the Commonwealth hoping to land Amazon's second headquarters to submit their bids.

Boston's proposal focuses on Suffolk Downs, the former horce racing track at the city's border with Revere, Mayor Marty Walsh confirmed. Another top real estate offering pushed by developers includes the Union Point development at the former South Weymouth Naval Air Station. Others have advocated for more urban locations, such as Boston's Seaport District.

"I feel good where we are, and we will see what happens with the first round," Mayor Marty Walsh said.

Amazon's second headquarters could bring as many as 50,000 jobs and $5 billion in investments. Applications are expected to come from dozens of U.S. states and Canadian provinces.

Amazon asked state and regional leaders to coordinate no more than one bid from any metropolitan area, but that hasn't stopped multiple cities in greater Boston from making rival bids. There are two alone from northeast Massachusetts' Merrimack Valley - one from a cluster of municipalities in greater Lawrence and another from greater Lowell.

New Bedford also is applying, touting itself as "the inspiring place from which Herman Melville's novel 'Moby Dick' began." Leominster Mayor Dean Mazzarella is pitching his city as "the hidden jewel" while also dismissing the attractiveness of a Boston campus, saying Amazon "can't afford to be anywhere where their employees are fatigued and tired by the time they reach work in the morning." Worcester is offering up to $500 million in tax breaks and sending Amazon a slick promotional video to lure the tech giant.

"I think we showed we are serious about competing," said Tim Murray of the Worcester Chamber of Commerce.

Massachusetts Gov. Charlie Baker is coordinating a statewide pitch expected to highlight a handful of locations deemed the most competitive, but he said last week he also will "give folks who are bidding locally or regionally an opportunity to put a compendium on the back of our bid." He said he is encouraged by the number of Bay State cities that have entered the race.

Meanwhile, Maine, New Hampshire and Rhode Island are also making pitches, promising Amazon a way of tapping into Boston's high-tech aura while avoiding its congestion and high prices.

Rhode Island is touting its universities, cultural amenities and train connections to Boston, while New Hampshire says it doesn't need financial gimmicks to make its case.

New Hampshire leaders on Wednesday announced a proposal centered in the town of Londonderry.

"Everyone else is still trying to play catch up to this tax incentive we created in 1789 - no sales tax and no income tax," Gov. Chris Sununu said.

Sununu said that "obviously the Boston region is a great place to go, but if you're going to be there, be in tax-free New Hampshire. It's all the benefits without the headaches."

In Maine, proposals for locations in Scarborough and Brunswick have been submitted. The proposals check off most of the things on Amazon's list, except for being located in a metropolitan area with more than 1 million people.