NCES has produced estimates of adults' literacy and numeracy skills for all U.S. states and counties. The data can be viewed as a map here: https://nces.ed.gov/surveys/piaac/state-county-estimates.asp
The National Center for Education Statistics surveyed 12,330 U.S. adults ages 16 to 74 living in households from 2012 to 2017 for the Program for the International Assessment of Adult Competencies (PIAAC), an international study involving over 35 countries. Using small area estimation models, indirect estimates of literacy and numeracy proficiency have been produced for all U.S. states and counties. By using PIAAC survey data in conjunction with data from the American Community Survey, the Skills Map provides reliable estimates of adult literacy and numeracy skills in all 50 states, all 3,141 counties, and the District of Columbia.
Note that the data from this survey is significantly different from past surveys. The statistical notes reportThe proficiency assessment instruments and scales used in the 2003 National Assessment of Adult Literacy (NAAL) and the 1992 National Adult Literacy Survey (NALS) were different from those used in PIAAC, and thus the estimates for counties and states from NAAL and NALS SAE are not comparable to the corresponding estimates from PIAAC. [Source]
Using the mapping tool, it is possible to get statistics by parish and compare to state averages and to other parishes (counties). The full report for Louisiana is below.
