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What does the light gray color on the map represent?

April 26, 2017color Gray light map

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What does the light gray color on the map represent?

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If you have not selected any ‘Background’ options, the default color for the background is light gray. Therefore this gray color in the first seven Main Maps represents ZCTAs that have no reported Section 330 patients, that have reported Section 330 patients but from grantees with less than 10 in a given ZCTA, and/or have no residents at all. In the last four Main Maps (representing only Census 2000 data) the gray color represents ZCTAs that do not have any residents at all.