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Codebook for NHGIS data file 'nhgis0008_ds249_20205_tract'
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Contents
    - Data Summary
    - Data Dictionary
    - Citation and Use
 
Additional documentation on NHGIS data sources is available at: 
    https://www.nhgis.org/documentation/tabular-data 
 
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Data Summary
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Year:             2016-2020
Geographic level: Census Tract (by State--County)
Extent:           All areas
Dataset:          2020 American Community Survey: 5-Year Data [2016-2020, Block Groups & Larger Areas]
   NHGIS code:    2016_2020_ACS5a
   NHGIS ID:      ds249
Breakdown(s):     Geographic Component:
                     Total area (00)
Data type(s):     (E) Estimates
                  (M) Margins of error
 
Tables:
 
1. Educational Attainment for the Population 25 Years and Over
   Universe:    Population 25 years and over
   Source code: B15003
   NHGIS code:  AMRZ
 
2. Median Household Income in the Past 12 Months (in 2020 Inflation-Adjusted Dollars)
   Universe:    Households
   Source code: B19013
   NHGIS code:  AMR8
 
3. Employment Status for the Population 16 Years and Over
   Universe:    Population 16 years and over
   Source code: B23025
   NHGIS code:  AMT9
 
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Data Dictionary
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Context Fields 
        GISJOIN:     GIS Join Match Code
        YEAR:        Data File Year
        STUSAB:      State Postal Abbreviation
        REGIONA:     Region Code
        DIVISIONA:   Division Code
        STATE:       State Name
        STATEA:      State Code
        COUNTY:      County Name
        COUNTYA:     County Code
        COUSUBA:     County Subdivision Code
        PLACEA:      Place/Remainder Code
        TRACTA:      Census Tract Code
        BLKGRPA:     Block Group Code
        CONCITA:     Consolidated City Code
        AIANHHA:     American Indian Area/Alaska Native Area/Hawaiian Home Land Code
        RES_ONLYA:   American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only) Code
        TRUSTA:      American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land Code
        AIHHTLI:     American Indian Trust Land/ Hawaiian Home Land Indicator
        AITSCEA:     Tribal Subdivision/Remainder Code
        ANRCA:       Alaska Native Regional Corporation Code
        CBSAA:       Metropolitan Statistical Area/Micropolitan Statistical Area Code
        CSAA:        Combined Statistical Area Code
        METDIVA:     Metropolitan Division Code
        NECTAA:      New England City and Town Area Code
        CNECTAA:     Combined New England City and Town Area Code
        NECTADIVA:   New England City and Town Area Division Code
        UAA:         Urban Area Code
        CDCURRA:     Congressional District (2019-2021, 116th Congress) Code
        SLDUA:       State Legislative District (Upper Chamber) Code
        SLDLA:       State Legislative District (Lower Chamber) Code
        ZCTA5A:      5-Digit ZIP Code Tabulation Area Code
        SUBMCDA:     Subminor Civil Division Code
        SDELMA:      School District (Elementary)/Remainder Code
        SDSECA:      School District (Secondary)/Remainder Code
        SDUNIA:      School District (Unified)/Remainder Code
        PCI:         Principal City Indicator
        PUMAA:       Public Use Microdata Area Code
        GEOID:       Census Geographic Identifier
        BTTRA:       Tribal Census Tract Code
        BTBGA:       Tribal Block Group Code
 
Data Type (E):
    Estimates
 
        NAME_E:      Area Name
 
    Table 1:     Educational Attainment for the Population 25 Years and Over
    Universe:    Population 25 years and over
    Source code: B15003
    NHGIS code:  AMRZ
        AMRZE001:    Total
        AMRZE002:    No schooling completed
        AMRZE003:    Nursery school
        AMRZE004:    Kindergarten
        AMRZE005:    1st grade
        AMRZE006:    2nd grade
        AMRZE007:    3rd grade
        AMRZE008:    4th grade
        AMRZE009:    5th grade
        AMRZE010:    6th grade
        AMRZE011:    7th grade
        AMRZE012:    8th grade
        AMRZE013:    9th grade
        AMRZE014:    10th grade
        AMRZE015:    11th grade
        AMRZE016:    12th grade, no diploma
        AMRZE017:    Regular high school diploma
        AMRZE018:    GED or alternative credential
        AMRZE019:    Some college, less than 1 year
        AMRZE020:    Some college, 1 or more years, no degree
        AMRZE021:    Associate's degree
        AMRZE022:    Bachelor's degree
        AMRZE023:    Master's degree
        AMRZE024:    Professional school degree
        AMRZE025:    Doctorate degree
 
    Table 2:     Median Household Income in the Past 12 Months (in 2020 Inflation-Adjusted Dollars)
    Universe:    Households
    Source code: B19013
    NHGIS code:  AMR8
        AMR8E001:    Median household income in the past 12 months (in 2020 inflation-adjusted dollars)
 
    Table 3:     Employment Status for the Population 16 Years and Over
    Universe:    Population 16 years and over
    Source code: B23025
    NHGIS code:  AMT9
        AMT9E001:    Total
        AMT9E002:    In labor force
        AMT9E003:    In labor force: Civilian labor force
        AMT9E004:    In labor force: Civilian labor force: Employed
        AMT9E005:    In labor force: Civilian labor force: Unemployed
        AMT9E006:    In labor force: Armed Forces
        AMT9E007:    Not in labor force
 
Data Type (M):
    Margins of error
 
        NAME_M:      Area Name
 
    Table 1:     Educational Attainment for the Population 25 Years and Over
    Universe:    Population 25 years and over
    Source code: B15003
    NHGIS code:  AMRZ
        AMRZM001:    Total
        AMRZM002:    No schooling completed
        AMRZM003:    Nursery school
        AMRZM004:    Kindergarten
        AMRZM005:    1st grade
        AMRZM006:    2nd grade
        AMRZM007:    3rd grade
        AMRZM008:    4th grade
        AMRZM009:    5th grade
        AMRZM010:    6th grade
        AMRZM011:    7th grade
        AMRZM012:    8th grade
        AMRZM013:    9th grade
        AMRZM014:    10th grade
        AMRZM015:    11th grade
        AMRZM016:    12th grade, no diploma
        AMRZM017:    Regular high school diploma
        AMRZM018:    GED or alternative credential
        AMRZM019:    Some college, less than 1 year
        AMRZM020:    Some college, 1 or more years, no degree
        AMRZM021:    Associate's degree
        AMRZM022:    Bachelor's degree
        AMRZM023:    Master's degree
        AMRZM024:    Professional school degree
        AMRZM025:    Doctorate degree
 
    Table 2:     Median Household Income in the Past 12 Months (in 2020 Inflation-Adjusted Dollars)
    Universe:    Households
    Source code: B19013
    NHGIS code:  AMR8
        AMR8M001:    Median household income in the past 12 months (in 2020 inflation-adjusted dollars)
 
    Table 3:     Employment Status for the Population 16 Years and Over
    Universe:    Population 16 years and over
    Source code: B23025
    NHGIS code:  AMT9
        AMT9M001:    Total
        AMT9M002:    In labor force
        AMT9M003:    In labor force: Civilian labor force
        AMT9M004:    In labor force: Civilian labor force: Employed
        AMT9M005:    In labor force: Civilian labor force: Unemployed
        AMT9M006:    In labor force: Armed Forces
        AMT9M007:    Not in labor force
 
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Citation and Use of NHGIS Data
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        IPUMS National Historical Geographic Information System: Version 21.0 
        [dataset]. Minneapolis, MN: IPUMS. 2026. 
        http://doi.org/10.18128/D050.V21.0

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