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Codebook for NHGIS data file 'nhgis1270_ds244_20195_blck_grp'
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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:             2015-2019
Geographic level: Block Group (by State--County--Census Tract)
Extent:           Delaware
                  District of Columbia
Dataset:          2019 American Community Survey: 5-Year Data [2015-2019, Block Groups & Larger Areas]
   NHGIS code:    2015_2019_ACS5a
   NHGIS ID:      ds244
Breakdown(s):     Geographic Subarea:
                     Total area (00)
Data type(s):     (E) Estimates
                  (M) Margins of error
 
Tables:
 
1. Sex by Age
   Universe:    Total population
   Source code: B01001
   NHGIS code:  ALT0
 
2. Median Age by Sex
   Universe:    Total population
   Source code: B01002
   NHGIS code:  ALT1
 
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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 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:     Sex by Age
    Universe:    Total population
    Source code: B01001
    NHGIS code:  ALT0
        ALT0E001:    Total
        ALT0E002:    Male
        ALT0E003:    Male: Under 5 years
        ALT0E004:    Male: 5 to 9 years
        ALT0E005:    Male: 10 to 14 years
        ALT0E006:    Male: 15 to 17 years
        ALT0E007:    Male: 18 and 19 years
        ALT0E008:    Male: 20 years
        ALT0E009:    Male: 21 years
        ALT0E010:    Male: 22 to 24 years
        ALT0E011:    Male: 25 to 29 years
        ALT0E012:    Male: 30 to 34 years
        ALT0E013:    Male: 35 to 39 years
        ALT0E014:    Male: 40 to 44 years
        ALT0E015:    Male: 45 to 49 years
        ALT0E016:    Male: 50 to 54 years
        ALT0E017:    Male: 55 to 59 years
        ALT0E018:    Male: 60 and 61 years
        ALT0E019:    Male: 62 to 64 years
        ALT0E020:    Male: 65 and 66 years
        ALT0E021:    Male: 67 to 69 years
        ALT0E022:    Male: 70 to 74 years
        ALT0E023:    Male: 75 to 79 years
        ALT0E024:    Male: 80 to 84 years
        ALT0E025:    Male: 85 years and over
        ALT0E026:    Female
        ALT0E027:    Female: Under 5 years
        ALT0E028:    Female: 5 to 9 years
        ALT0E029:    Female: 10 to 14 years
        ALT0E030:    Female: 15 to 17 years
        ALT0E031:    Female: 18 and 19 years
        ALT0E032:    Female: 20 years
        ALT0E033:    Female: 21 years
        ALT0E034:    Female: 22 to 24 years
        ALT0E035:    Female: 25 to 29 years
        ALT0E036:    Female: 30 to 34 years
        ALT0E037:    Female: 35 to 39 years
        ALT0E038:    Female: 40 to 44 years
        ALT0E039:    Female: 45 to 49 years
        ALT0E040:    Female: 50 to 54 years
        ALT0E041:    Female: 55 to 59 years
        ALT0E042:    Female: 60 and 61 years
        ALT0E043:    Female: 62 to 64 years
        ALT0E044:    Female: 65 and 66 years
        ALT0E045:    Female: 67 to 69 years
        ALT0E046:    Female: 70 to 74 years
        ALT0E047:    Female: 75 to 79 years
        ALT0E048:    Female: 80 to 84 years
        ALT0E049:    Female: 85 years and over
 
    Table 2:     Median Age by Sex
    Universe:    Total population
    Source code: B01002
    NHGIS code:  ALT1
        ALT1E001:    Median age: Total
        ALT1E002:    Median age: Male
        ALT1E003:    Median age: Female
 
Data Type (M):
    Margins of error
 
        NAME_M:      Area Name
 
    Table 1:     Sex by Age
    Universe:    Total population
    Source code: B01001
    NHGIS code:  ALT0
        ALT0M001:    Total
        ALT0M002:    Male
        ALT0M003:    Male: Under 5 years
        ALT0M004:    Male: 5 to 9 years
        ALT0M005:    Male: 10 to 14 years
        ALT0M006:    Male: 15 to 17 years
        ALT0M007:    Male: 18 and 19 years
        ALT0M008:    Male: 20 years
        ALT0M009:    Male: 21 years
        ALT0M010:    Male: 22 to 24 years
        ALT0M011:    Male: 25 to 29 years
        ALT0M012:    Male: 30 to 34 years
        ALT0M013:    Male: 35 to 39 years
        ALT0M014:    Male: 40 to 44 years
        ALT0M015:    Male: 45 to 49 years
        ALT0M016:    Male: 50 to 54 years
        ALT0M017:    Male: 55 to 59 years
        ALT0M018:    Male: 60 and 61 years
        ALT0M019:    Male: 62 to 64 years
        ALT0M020:    Male: 65 and 66 years
        ALT0M021:    Male: 67 to 69 years
        ALT0M022:    Male: 70 to 74 years
        ALT0M023:    Male: 75 to 79 years
        ALT0M024:    Male: 80 to 84 years
        ALT0M025:    Male: 85 years and over
        ALT0M026:    Female
        ALT0M027:    Female: Under 5 years
        ALT0M028:    Female: 5 to 9 years
        ALT0M029:    Female: 10 to 14 years
        ALT0M030:    Female: 15 to 17 years
        ALT0M031:    Female: 18 and 19 years
        ALT0M032:    Female: 20 years
        ALT0M033:    Female: 21 years
        ALT0M034:    Female: 22 to 24 years
        ALT0M035:    Female: 25 to 29 years
        ALT0M036:    Female: 30 to 34 years
        ALT0M037:    Female: 35 to 39 years
        ALT0M038:    Female: 40 to 44 years
        ALT0M039:    Female: 45 to 49 years
        ALT0M040:    Female: 50 to 54 years
        ALT0M041:    Female: 55 to 59 years
        ALT0M042:    Female: 60 and 61 years
        ALT0M043:    Female: 62 to 64 years
        ALT0M044:    Female: 65 and 66 years
        ALT0M045:    Female: 67 to 69 years
        ALT0M046:    Female: 70 to 74 years
        ALT0M047:    Female: 75 to 79 years
        ALT0M048:    Female: 80 to 84 years
        ALT0M049:    Female: 85 years and over
 
    Table 2:     Median Age by Sex
    Universe:    Total population
    Source code: B01002
    NHGIS code:  ALT1
        ALT1M001:    Median age: Total
        ALT1M002:    Median age: Male
        ALT1M003:    Median age: Female
 
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Citation and Use of NHGIS Data
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        Steven Manson, Jonathan Schroeder, David Van Riper, Tracy Kugler, and Steven Ruggles. 
        IPUMS National Historical Geographic Information System: Version 17.0 
        [dataset]. Minneapolis, MN: IPUMS. 2022. 
        http://doi.org/10.18128/D050.V17.0

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