Butler County Fertility Statistics
The American Community Survey (ACS), conducted by the U.S. Census Bureau, publishes estimates on fertility each year. The survey asks women between 15 and 50 years old if they have given birth in the past 12 months.
Based on a representative survey sample, the ACS reports estimated counts of new mothers across the United States. These counts are further broken down by various other characteristics—perhaps most notably by new mothers' marital status.
Unlike the Census, which is an exact count of people and households every ten years, ACS statistics are estimated based on a representative survey sample. For locations with populations under 60,000, the ACS is only available in 5-year estimates, rather than single-year periods. The 5-year estimates provide greater geographical granularity but a less granular time period.