According to data from the Bureau of Labor Statistics, unemployment has fallen to 3.7%.
From the Bureau Commissioner’s statement:
The unemployment rate declined to 3.7 percent in September, and total nonfarm payroll employment increased by 134,000, the U.S. Bureau of Labor Statistics reported today. Job gains occurred in professional and business services, in health care, and in transportation and warehousing.

As reported by The Hill,
The U.S. economy added 134,000 jobs in September, well below expectations, as the labor market still shows strength heading into the fall.
The unemployment rate fell to 3.7 percent for the lowest level since December 1969, the Labor Department reported on Friday.
National unemployment averages may hide local economic realities. NACo’s County Explorer depicts a clickable map with varying unemployment rates in counties throughout the U.S. This data is not updated to tie-in with the current release, but reveals the uneven nature of employment for 2017.

For more information see the Bureau of Labor Statistics, Unemployment hits 49-year low, economy adds 134K jobs in September from The Hill, and the NACo County Explorer.