Percentage of adults ages 25 years and over with a bachelor’s degree or higher
U.S Census Bureau, American Community Survey (ACS) 5-Year Estimates, various years; B15001: SEX BY AGE BY EDUCATIONAL ATTAINMENT FOR THE POPULATION 18 YEARS AND OVER - Universe: Population 18 years and over.
2000 Decennial Census Table: PCT025: SEX BY AGE BY EDUCATIONAL ATTAINMENT FOR THE POPULATION 18 YEARS AND OVER  - Universe: Population 18 years and over; Census 2000 Summary File 3 (SF 3) - Sample Data.
Please note, the U.S. Census Bureau’s American Community Survey (ACS) 5-year estimates provide average characteristics aggregated over a 5-year period. The primary advantage of using multiyear estimates is the increased statistical reliability of the data for less populated areas and small population subgroups. However, 5-year estimates are less current than single year estimates (i.e., since they are derived from averages over five calendar years) and should not be compared to single year estimates. The Census Bureau suggests comparing periods that do not overlap, such as comparing 2007-2011 with 2012-2016, which means waiting longer to identify a trend. However, in areas undergoing fundamental shifts in the size or composition of the population, change may be so substantial that it will be obvious after only a few years. Please see the ACS data use handbook for more information (https://www.census.gov/content/dam/Census/library/publications/2008/acs/ACSGeneralHandbook.pdf).
A 90 percent confidence interval for each estimate can be found at the footnotes below.