While the Post Office has certain postage classes which offer Sunday delivery, a contract between Amazon and USPS gives the Amazon.com customer delivery seven days a week. Amazon.com does ship packages which the United States Postal Service (USPS) will deliver on Sunday. While not all cities are included, Amazon.com continues to add cities to the list.

Here are some of the cities known to be getting Sunday delivery of Amazon.com packages. If you do not see you city, does not mean it is not on the national list, just that no news reports have included it on their lists. Since the delivery update indicates the package will be delivered on 19 April, take that as confirmation your city is on the national list.

Austin, Texas

Boston, Massachusetts

Cincinnati, Ohio

College Station, Texas

Columbus, Ohio

Dallas, Texas

Eureka, California, to Sunnyvale, California, area

Greensboro, North Carolina

Houston, Texas

Illinois, Southwestern area

Indianapolis, Indiana

Lexington, Kentucky

Los Angeles, California area

Louisville, Kentucky

New Jersey, Northern area

New Orleans, Louisiana

New York metropolitan areas

Oklahoma City, Oklahoma

Philadelphia, Pennsylvania

Phoenix, Arizona

Portland, Oregon

Richmond, Virginia

St. Louis, Missouri

San Antonio, Texas

San Diego, California

Seattle, Washington

Shreveport, Louisiana

Waco, Texas

Washington, D.C. (includes Virginia suburbs)

USPS delivers Amazon and priority express mail every day of the week including Sundays

Because it is going to be delivered on Sunday, that's why.

its a pc thing