Demographics Overview

Summary Statistics of Demographics

Summary Statistics of Demographic Indicators for Arlington County
Statistics Mean Standard Deviation Median Minimum Maximum
Total Population 3957.02 2000.39 3939.00 0 8455.00
% Population: African-American 8.77 8.71 6.23 0 35.03
% Population: Asian 10.12 5.82 8.48 0 25.59
% Population: Hispanic or Latino 14.53 9.38 12.00 0 43.13
% Population: White 72.43 14.16 74.83 26 100.00
% Population: Other Race 12.43 6.60 10.95 0 36.32
Median Household Income (HHI): All 129886.81 46690.08 121690.00 37332 250001.00
Median HHI: African-American 83521.25 42883.77 76043.50 24070 226000.00
Median HHI: Asian 124664.00 59416.36 110152.50 12955 250001.00
Median HHI: Hispanic or Latino 112690.00 55616.09 104766.00 2499 250001.00
Median HHI: White 138548.68 44176.81 126484.00 61181 250001.00
Median HHI: Other Race 133182.57 48303.60 130813.50 73507 250001.00
% in Poverty: All 6.49 4.57 5.76 0 18.63
% in Poverty: African-American 11.95 18.01 5.41 0 100.00
% in Poverty: Asian 10.84 13.53 3.97 0 55.07
% in Poverty: Hispanic or Latino 8.71 9.52 5.94 0 40.18
% in Poverty: White 4.78 3.23 4.24 0 14.69
% in Poverty: Other Race 6.19 9.98 0.00 0 36.77
% Population under 18 16.97 8.47 17.75 0 31.88
% with an Ambulatory Disability 0.82 0.68 0.69 0 2.43
% Population with No Vehicle 11.32 9.68 8.71 0 35.72
Mean number of properties<br>with greenspace 0.50 0.38 0.55 0 1.00
% Pop. with no Health Insurance 5.47 4.38 4.76 0 16.86
% of housing with rent > $30K 35.23 15.31 35.10 0 74.40

Demographic Breakdown by Race

Park Access

Circle Radius Methods

When we use 1/2 mile radius circles as proxies for access 99.65 percent of residences are covered with park access. This is incredibly high. However, this doesn't take into account park quality, amenities, or acreage.

Distance Coverage
1/2 Mile Circle 99.65424

Traveltime Isochrone Method

To get an idea of park access, we computed coverage as the percentage of total residences that are covered within time-based isochrones from the centroid of each park. We did this for walking, driving, and public transportation. Here we feature the walking map.

Walking

When we create access polygons as 5-, 10-, and 15-minute polygons of walking, 32 percent, 85, ad 99 percent of residences are covered respectively. Within a short walk this isn't very high coverage, but within 10 minutes this is high coverage.

Time Coverage
5 Minutes 32.81442
10 Minutes 85.48678
15 Minutes 98.99169

Amenity Access

To measure park access we also care about measuring access to good parks. To measure park goodness we use amenities as a proxy variable. The following maps and tables measure individual's access to different types of amenities. We did this for tennis courts, basketball courts, playgrounds, and parking. We will highlight playgrounds below.

Playgrounds

So similarly to what we saw above, we now evaluate access in terms of the percent of total residences in the county that have access to the playground amenity within a 5-, 10-, or 15-minute isochrone via walking, public transportation, or driving.

Walking
Time Coverage
5 Minutes 13.02459
10 Minutes 53.55975
15 Minutes 85.74056
Public Transportation
Time Coverage
5 Minutes 13.01097
10 Minutes 54.11841
15 Minutes 87.80828
Driving
Time Coverage
5 Minutes 0.5739883
10 Minutes 81.2338193
15 Minutes 100.0000000

Two-Step Floating Catchment Area Scores

In addition, we investigated how park accessibility varies across Census tracts within racial groups. We used the two-step floating catchment area method to calculate spatial accessibility scores for Census tracts in Arlington County by race. These scores give a measure of accessibility for each tract to the parks and their amenities in Arlington County and are calculated as the summation of the supply to demand ratio for each park contained in the catchment area of the Census tract. The supply of a park is defined by its acreage and its demand is defined by the total population count of a racial group in a Census tract. The catchment areas for both the parks as well as Census tracts are defined by a distance of one mile. Census tracts with higher scores are considered to have more accesibility to parks and their amenities.

All Park Acreage

Here, we consider every park in Arlington County when calculating the accessibility of the Census tracts. We can see that the West to Southwest area of Arlington County has the highest level of accessibility. We observed that for the Black, Asian, and Other populations, however, there are high levels of accessibility in the Northern region. This is due to the fact that those areas have a number of large acreage parks combined with the low numbers of people who identify as Black, Asian, or Other.

White

Black

Asian

Other