Nation's Last 24-hour Post Office Window is Closing.

The Chicago Sun Times reports the nation's last 24-hour post office window is closing.

Beginning June 6, the downtown Chicago location at 433 W. Harrison St. (shown here)will be open only from 7:30 a.m. to midnight seven days a week, according to Mark Reynolds, a U.S. Postal Service spokesman who is quoted in the article.

Chicago had been the last city in the United States with a 24-hour window staffed by postal workers. New York City closed its last round-the-clock post office, The James A. Farley Post Office across from Penn Station, earlier this month.

"Demand for 24-hour service has dropped sharply in recent years. It's just changing customer habits, and a lot of people are using our Web site," Reynolds said.