1880
The Census bureau provides a list of the 100 largest cities in the United States during this year.
| Rank | City | State | Population | Notes |
| 1 | New York | New York | 1,206,299 | This marks the first time the population of a U.S. city exceeds 1 million. |
| 2 | Philadelphia | Pennsylvania | 847,170 | |
| 3 | Brooklyn | New York | 566,663 | |
| 4 | Chicago | Illinois | 503,185 | Great Chicago Fire destroyed a third of the city in 1871. |
| 5 | Boston | Massachusetts | 362,839 | |
| 6 | St. Louis | Missouri | 350,518 | The city of St. Louis seceded from St. Louis County in 1876. |
| 7 | Baltimore | Maryland | 332,313 | |
| 8 | Cincinnati | Ohio | 255,139 | |
| 9 | San Francisco | California | 233,959 | |
| 10 | New Orleans | Louisiana | 216,090 | Last appearance in the top 10. |
Read more about this topic: Largest Cities In The United States By Population By Decade