Home Owner Loan Corporation (HOLC) ... - Historical HOLC neighborhood ratings (A, B, C, D) mapped to 2020 census tracts

Data dictionary for this resource

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Data Dictionary

Column Type Label Description
geoid20 text 2020 census tract FIPS codes
class1 text HOLC grade covering the most area

HOLC letter grade of the HOLC-rated polygon that covers the largest proportion of the census tract's HOLC-rated area, e.g., A.

class1_lbl text Text label for class1

Text label for class1, e.g., "Mainly A"

class2 text HOLC grade covering the most and second most area

HOLC letter grade of the HOLC-rated polygon that covers the largest and second largest proportion of the census tract's HOLC-rated area, e.g., A-B, where A covers the largest proportion of rated area, and B covers the second largest proportion of rated area.

class2_lbl text Text label for class2

Text label for class2, e.g., "Mainly A, some B"

class2_red text Simplified 10-level version of class 2

Simplified 10-level version of class 2 that combines relatively rare rating combinations. For example "Mainly C, some A" and "Mainly D, some A" were combined into "Mainly C or D, some A".

class3 text Ratings covering the most, second and third most area, e.g., "A-B-D"

HOLC letter grade of the HOLC-rated polygon that covers the largest, second, and third largest proportion of the census tract's HOLC-rated area, e.g., A-B-D, where A covers the largest proportion of rated area, B covers the second largest proportion of rated area, and D covers the third largest proportion of HOLC-rated area.

class3_lbl text Text label for class3, e.g., "Mainly A, some B, some D"

Text label for class3, e.g., "Mainly A, some B, some D"

area_total numeric Total tract area not covered by water

Calculated as the area of the 2020 TIGER/Line census tract polygon that is not covered by water. Water coverage is obtained from 2020 TIGER/Line water shapefiles.

area_rated numeric Percentage of non-water area covered by A, B, C, or D rated area
area_U numeric Percentage of non-water area covered by unrated rated area
area_A numeric Percentage of non-water area covered by A rated area
area_B numeric Percentage of non-water area covered by B rated area
area_C numeric Percentage of non-water area covered by C rated area
area_D numeric Percentage of non-water area covered by D rated area