| | Norristown, PA | Plymouth Meeting, PA | United States |
| Population | 35,607 | 6,744 | 329,725,481 |
| Female Population | 51.0% | 53.0% | 50.5% |
| Male Population | 49.0% | 47.0% | 49.5% |
| Median Age | 33.6 | 40.1 | 38.4 |
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| Population - 2010 | 34,364 | 5,907 | 309,327,143 |
| Population - 2000 | 31,282 | 5,593 | 285,036,114 |
| Population - 1990 | 30,749 | 6,241 | 251,960,433 |
| Pop. 2000 to Now | 9.7% | 14.2% | 15.6% |
| Pop. 1990 to Now | 11.6% | 2.3% | 30.8% |
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| Population Density | 10,130.0 | 1,787.4 | 93.4 |
| Land Area | 3.5 | 3.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Norristown, PA | Plymouth Meeting, PA | United States |
| Age 0 to 4 | 8.8% | 6.5% | 5.9% |
| Age 5 to 9 | 7.0% | 7.3% | 6.1% |
| Age 10 to 14 | 5.6% | 4.4% | 6.6% |
| Age 15 to 17 | 3.9% | 3.1% | 3.9% |
| Age 18 to 20 | 3.3% | 1.3% | 4.0% |
| Age 21 to 24 | 7.1% | 2.4% | 5.2% |
| Age 25 to 34 | 17.0% | 16.0% | 13.8% |
| Age 35 to 44 | 15.2% | 13.3% | 12.9% |
| Age 45 to 54 | 11.5% | 10.9% | 12.6% |
| Age 55 to 59 | 5.1% | 7.1% | 6.7% |
| Age 60 to 64 | 5.2% | 6.7% | 6.3% |
| Age 65 to 74 | 6.3% | 11.6% | 9.6% |
| Age 75 to 84 | 2.9% | 5.8% | 4.5% |
| Age 85 and over | 1.2% | 3.5% | 1.9% |
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| Race | | | |
| | Norristown, PA | Plymouth Meeting, PA | United States |
| White | 28.8% | 74.2% | 59.4% |
| Black | 33.4% | 4.9% | 12.2% |
| Asian | 3.0% | 9.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.7% | 0.3% | 0.4% |
| Two or More Races | 7.9% | 2.5% | 3.2% |
| Hispanic | 26.1% | 8.2% | 18.4% |
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| Marriage & Family | | | |
| | Norristown, PA | Plymouth Meeting, PA | United States |
| Married Population | 36.9% | 57.8% | 49.8% |
| Currently Married | 34.3% | 56.5% | 48.0% |
| Married but Separated | 2.6% | 1.3% | 1.8% |
| Single Population | 63.1% | 42.2% | 50.2% |
| Never Married | 47.8% | 24.2% | 33.8% |
| Divorced | 10.4% | 9.4% | 10.8% |
| Widowed | 5.0% | 8.6% | 5.6% |
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| Household Size | 2.59 | 2.28 | 2.60 |
| Households | 13,411 | 2,930 | 124,010,992 |
| Family Households | 8,291 | 1,806 | 80,755,759 |
| Married couple, w/children | 28.5% | 35.0% | 30.5% |
| Married couple, no children | 23.9% | 49.0% | 42.9% |
| Non Family Households | 5,120 | 1,124 | 43,255,233 |
| Single householder, w/children | 30.0% | 8.1% | 15.8% |
| Single householder, no children | 17.5% | 7.9% | 10.8% |