1910
The 1910 Census was the Thirteenth. The Census Bureau provides a list of the 100 largest cities in that year.
| Rank | City | State | Population | Notes |
| 1 | New York | New York | 4,766,883 | Much of the population of New York City was in Manhattan, which reached its historical high of over 2.3 million. However, the other boroughs began to grow rapidly as the Interborough Rapid Transit system expanded. |
| 2 | Chicago | Illinois | 2,185,283 | |
| 3 | Philadelphia | Pennsylvania | 1,549,008 | |
| 4 | St. Louis | Missouri | 687,029 | |
| 5 | Boston | Massachusetts | 670,585 | |
| 6 | Cleveland | Ohio | 560,663 | |
| 7 | Baltimore | Maryland | 558,485 | |
| 8 | Pittsburgh | Pennsylvania | 533,905 | Pittsburgh entered the Top 10 after annexing the neighboring city of Allegheny in 1907. This is now the city's North Side. |
| 9 | Detroit | Michigan | 465,766 | First appearance in the top 10. |
| 10 | Buffalo | New York | 423,715 | Last appearance in the top 10. |
Read more about this topic: Largest Cities In The United States By Population By Decade