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| Year |
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| 1950 | 67,930 |
| 1960 | 133,487 |
| 1970 | 225,975 |
| 1980 | 308,701 |
| 1990 | 448,284 |
| 2000 |
477,123
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Note: for the years 1950 and 1960, data reflects persons 14 years of age and older; all later years reflect persons 16 years of age and older. Source: US Bureau of the Census; Montgomery County Department of Park and Planning, Research and Technology Center. |
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