1970
The 1970 Census was the Nineteenth. The Census Bureau provides a list of the 100 largest cities in that year.
| Rank | City | State | Population | Notes |
| 1 | New York | New York | 7,894,862 | |
| 2 | Chicago | Illinois | 3,366,957 | |
| 3 | Los Angeles | California | 2,816,061 | |
| 4 | Philadelphia | Pennsylvania | 1,948,609 | |
| 5 | Detroit | Michigan | 1,511,482 | |
| 6 | Houston | Texas | 1,232,802 | First city in Texas to surpass 1 million. |
| 7 | Baltimore | Maryland | 905,759 | |
| 8 | Dallas | Texas | 844,401 | First appearance in top 10. |
| 9 | Washington | District of Columbia | 756,510 | Last appearance on top 10. |
| 10 | Cleveland | Ohio | 750,903 | Last appearance on top 10. Cleveland is notably smaller by population and larger by area, therefore less dense than it was in 1920. |
Read more about this topic: Largest Cities In The United States By Population By Decade