Fig. 2: Variations in spatial inequality of property flood risk among county groups.
a Coastline/non-coastline counties, as defined by the US Census Bureau60. We identified 211 coastline counties and 2356 non-coastline counties. b Metropolitan/micropolitan/other counties, as identified by US Census Bureau61. The numbers are 1101, 601, and 865 respectively. c Asian/Black/White counties. The overrepresented race for each county is identified by comparing the proportion of non-Hispanic White, non-Hispanic Black, and non-Hispanic Asian populations to the average for all the counties (See Supplementary Note 1 for more details). We totally have 2025 White-dominated counties, 539 Black-dominated counties, and 3 Asian-dominated counties. We obtained the racial population data from the 2020 race and ethnicity data from the US Census Bureau38. d We used the median income quantile from 2020 American Community Survey48 to distinguish counties groups: Q1 (642 counties), Q2 (641 counties), Q3 (642 counties), and Q4 (642 counties). Note: The orange shading represents the boxplots for the SGI in coastline and non-coastline counties. The red shading differentiates the boxplots among metropolitan, micropolitan, and other counties. The green shading is used for the boxplots representing different racial groups: Asian, Black, and White. The blue shading indicates the median income quartiles (Q1, Q2, Q3, Q4) of the SGI distribution. The central line indicates the median, the box edges represent the interquartile range, and the outliers are indicated by individual points. ***p ≤ 0.01, **p ≤ 0.05, *p ≤ 0.1. P values are obtained from t tests.
