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| General Information: | |
| City Class | Census Designated Place |
| Class by Population | 6 |
| Land Area | 2.959 |
| Water Bodies | 0.003 |
| State | Maryland |
| Population(2000) | 14998 |
| Males: | 7427 |
| Females : | 7571 |
Map of Adelphi, Maryland:
| Races in Adelphi: | |
| White | 4421 |
| Black/African American | 5974 |
| Hispanic | 3860 |
| Asian | 1493 |
| American Indian & Alaska Native | 42 |
| Native Hawaian Pacific Islander | 9 |
| Multi Race | 804 |
| Ohter Race | 2255 |
| Population by Age: | |
| Under 5 years | 1105 |
| 5 to 17 Years | 2302 |
| 18 to 21 years | 950 |
| 22 to 29 years | 2568 |
| 30 to 39 yeras | 2667 |
| 40 to 49 years | 2069 |
| 50 to 64 years | 1908 |
| 64 and over | 1429 |
| Population Median Age: | |
| Average Median Age | 31.8 |
| Male Median Age | 31 |
| Female Median Age | 32.8 |
| Housing Information in Adelphi , MD | |
| Total Housing Units | 5627 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 295 |
| Owner Occupied Housing Units | 2787 |
| Renter Occupied Housing Units | 2545 |
| Family & Family Size in Adelphi , MD: | |
| Number of families | 3322 |
| Average Family size | 3.35 |
| Househols Information in Adelphi , MD: | |
| Number of Household | 5332 |
| Average Household Size | 2.77 |
| 1-person household, male | 631 |
| 1-person household, female : | 835 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 1117 |
| Family HH(married-couple family, no own childern under 18 yrs) | 1149 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 138 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 379 |