Fig. 1: The distribution of HOLC neighborhoods by type and city shows the overall within-city and across-city patterns.
From: Residential housing segregation and urban tree canopy in 37 US Cities

Larger and more segregated metropolitan areas tend to have more HOLC-defined neighborhoods. Cities are sorted by the number of A-graded neighborhoods. Only eight cities have ≥10 Grade-A neighborhoods (left) to permit within-city analyses. In the main analysis, all neighborhoods are used. *Johnson City/Birmingham, NY; **Holyoke/Chicopee, MA.