First it was Uber, now Amazon is entering in the fray, giving its Prime Now subscribers delivery service from 78 Chicago restaurants across 18 city zip codes. Chicago marks the sixth market offering food deliveries from Amazon, with a restaurant roster that includes Big Star, Lockdown Bar & Grill, Stan's Donuts & Coffee and RPM Steak.

Amazon pledges to expand the restaurant list, saying average delivery times are 39 minutes in the previous five markets (Austin, Texas; Baltimore; Los Angeles; Portland, Ore.; Seattle), according to a news release. The company began same-day delivery last year with groceries from Plum Market in Old Town, My Fit Foods and Sprinkles Cupcakes. Amazon hopes Chicagoans who prefer to stay indoors during the winter will lean on the service using their mobile app.

Delivery remains at no additional cost for now, but Amazon Restaurants GM Gus Lopez told the Tribune they may charge in the future. The service launched in the other markets in September. Prime subscribers pay Amazon $99 annually.

The news release included a statement from One Off Hospitality Group's Kimberly Galban, saying that the service "will likely change the restaurant delivery market in Chicago." How Amazon will separate itself from Uber, Seamless, Sprig and the rest of the pack remains to be seen.

Check out the participating restaurants below: