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| General Information: | |
| City Class | City |
| Class by Population | 6 |
| Land Area | 15.612 |
| Water Bodies | 1.181 |
| State | New Hampshire |
| Population(2000) | 20784 |
| Males: | 10099 |
| Females : | 10685 |
Map of Portsmouth, New Hampshire:
| Races in Portsmouth: | |
| White | 19443 |
| Black/African American | 442 |
| Hispanic | 280 |
| Asian | 508 |
| American Indian & Alaska Native | 44 |
| Native Hawaian Pacific Islander | 5 |
| Multi Race | 283 |
| Ohter Race | 59 |
| Population by Age: | |
| Under 5 years | 1009 |
| 5 to 17 Years | 2556 |
| 18 to 21 years | 615 |
| 22 to 29 years | 2901 |
| 30 to 39 yeras | 3869 |
| 40 to 49 years | 3139 |
| 50 to 64 years | 3311 |
| 64 and over | 3384 |
| Population Median Age: | |
| Average Median Age | 38.5 |
| Male Median Age | 36.6 |
| Female Median Age | 40.4 |
| Housing Information in Portsmouth , NH | |
| Total Housing Units | 10186 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 311 |
| Owner Occupied Housing Units | 4936 |
| Renter Occupied Housing Units | 4939 |
| Family & Family Size in Portsmouth , NH: | |
| Number of families | 4862 |
| Average Family size | 2.75 |
| Househols Information in Portsmouth , NH: | |
| Number of Household | 9875 |
| Average Household Size | 2.04 |
| 1-person household, male | 1685 |
| 1-person household, female : | 2161 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 1342 |
| Family HH(married-couple family, no own childern under 18 yrs) | 2388 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 127 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 502 |
Zip code in Portsmouth, New Hampshire:
| 03801 | 03802 | 03803 | 03804 |
Cities in New Hampshire (With population 10,000 or more):
| Berlin (10331) | Claremont (13151) | Concord (40687) | Derry (22661) | Dover (26884) |
| Keene (22563) | Laconia (16411) | Lebanon (12568) | Londonderry (11417) | Manchester (107006) |
| Nashua (86605) | Portsmouth (20784) | Rochester (28461) | Somersworth (11477) |