1920 United States census
The 1920 United States census, conducted by the Census Bureau during one month from January 5, 1920, determined the resident population of the United States to be 106,021,537, an increase of 15.0 percent over the 92,228,496 persons enumerated... Wikipedia
Start date: January 5, 1920
Location: United States
Least populous state: Nevada; 77,407
Most populous state: New York; 10,385,227
Total population: 106,021,537 (15.0%)