In November, Amazon announced that it teamed up with the USPS to start offering Sunday delivery in New York and Los Angeles with more areas to follow. On Thursday, the company announced the expansion of the service into fifteen new cities.

The new areas include: Austin, Cincinnati, College Station, Columbus, Dallas, Houston, Indianapolis, Lexington (KY), Louisville, New Orleans, Oklahoma City, Philadelphia, San Antonio, Shreveport, and Waco. The company said previously that Phoenix was on its list of cities that will get Sunday delivery, but it’s not on the new list.

“So far, the most common items delivered on Sunday include baby supplies such as newborn apparel, books and toys—Sunday delivery is clearly crossing errands off the weekend to-do list,” said Mike Roth, Amazon’s vice president of North America operations. “We know our Amazon customers love the convenience of everyday delivery, and we’re excited to be offering Sunday delivery in more cities across the U.S.”

The company says they have delivered millions of packages on Sundays so far, and the service will be rolled out to a “large portion” of the U.S. population this year. If you’re eligible to get Sunday deliveries, you’ll see this upon checkout.

Last week, Amazon also announced the expansion of its same-day delivery service. That’s now available in Baltimore, Boston, Chicago, Dallas, Indianapolis, Los Angeles, New York City, Philadelphia, Phoenix, San Francisco, Seattle, and Washington DC.

Meanwhile, the company is working on building infrastructure for its own delivery service, which would see it relying less on UPS and FedEx. It remains to be seen what impact this might have on a partnership with the USPS.

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