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| General Information: | |
| City Class | Census Designated Place |
| Class by Population | 6 |
| Land Area | 12.99 |
| Water Bodies | 0.003 |
| State | Maryland |
| Population(2000) | 31438 |
| Males: | 15190 |
| Females : | 16248 |
Map of Olney, Maryland:
| Races in Olney: | |
| White | 24849 |
| Black/African American | 2761 |
| Hispanic | 1576 |
| Asian | 2526 |
| American Indian & Alaska Native | 79 |
| Native Hawaian Pacific Islander | 14 |
| Multi Race | 694 |
| Ohter Race | 515 |
| Population by Age: | |
| Under 5 years | 2363 |
| 5 to 17 Years | 7447 |
| 18 to 21 years | 1095 |
| 22 to 29 years | 1885 |
| 30 to 39 yeras | 4968 |
| 40 to 49 years | 6229 |
| 50 to 64 years | 5446 |
| 64 and over | 2005 |
| Population Median Age: | |
| Average Median Age | 36.7 |
| Male Median Age | 35.8 |
| Female Median Age | 37.4 |
| Housing Information in Olney , MD | |
| Total Housing Units | 10415 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 141 |
| Owner Occupied Housing Units | 9349 |
| Renter Occupied Housing Units | 925 |
| Family & Family Size in Olney , MD: | |
| Number of families | 8648 |
| Average Family size | 3.34 |
| Househols Information in Olney , MD: | |
| Number of Household | 10274 |
| Average Household Size | 3.04 |
| 1-person household, male | 450 |
| 1-person household, female : | 817 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 4283 |
| Family HH(married-couple family, no own childern under 18 yrs) | 3057 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 136 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 630 |
Zip code in Olney, Maryland:
| 20830 | 20832 |