The chart and table below show changes in race and ethnicity in Greenbelt from 1970 to 2020.
| Race / Ethnicity | 1970 | 1980 | 1990 | 2000 | 2010 | 2020 |
|---|---|---|---|---|---|---|
| White alone | 17823 | 15003 | 14804 | 8526 | 6948 | 5581 |
| Black or African American alone | 230 | 1722 | 4085 | 8871 | 11032 | 12051 |
| American Indian and Alaska Native alone | 18 | 20 | 40 | 50 | 74 | 153 |
| Asian alone | 2586 | 2239 | 2335 | |||
| Native Hawaiian and Other Pacific Islander alone | 11 | 30 | 19 | |||
| Some Other Race alone | 128 | 515 | 2167 | 667 | 1995 | 2838 |
| Two or More Races | 745 | 750 | 1944 | |||
| Hispanic or Latino | 367 | 807 | 1383 | 3301 | 4280 |
Notes: Hispanic numbers come from a separate question on the Census surveys and are not additive for the race numbers. Some of the more recent categories — such as two or more races or Asian alone — have no counterparts for pre-2000 censuses.
Sources: data.census.gov decennial apportionment data tables for 2000, 2010, and 2020. IPUMS NHGIS time series data for 1970, 1980, and 1990.