Allentown-Bethlehem-Easton, PA Population by Decades
| Date |
Population |
Population
Change |
Annual
% Change |
| 1900 | 238,090 | - | - |
| 1910 | 299,345 | 61,255 | 2.3 |
| 1920 | 364,172 | 64,827 | 2.0 |
| 1930 | 405,577 | 41,405 | 1.1 |
| 1940 | 408,227 | 2,650 | 0.1 |
| 1950 | 441,008 | 32,781 | 0.8 |
| 1960 | 481,837 | 40,829 | 0.9 |
| 1970 | 520,245 | 38,408 | 0.8 |
| 1980 | 551,052 | 30,807 | 0.6 |
| 1990 | 595,081 | 44,029 | 0.8 |
| 2000 | 637,958 | 42,877 | 0.7 |
Source: U.S. Bureau of Census
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