Release: Premature Death Rate
The "crude death rate" is the number of deaths divided by the population, multiplied by 100,000.
The CDC no longer calculates rates for a county when there are fewer than 20 death. FRED records these instances as missing observations in the series.
Centers for Disease Control and Prevention, Premature Death Rate for St. Louis County, MO [CDC20N2U029189], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CDC20N2U029189, July 21, 2019.