Demographics
As of 31 January 2012 Lahti’s population was 102 358, making it the eighth largest city in Finland by population.
| Population by district | 1964 | 1970 | 1980 | 1990 | 2000 | 2007 |
|---|---|---|---|---|---|---|
| Center (Keskusta) | 27,400 | 21,800 | 15,600 | 13,700 | 17,280 | 19,778 |
| Laune | 13,200 | 17,100 | 23,300 | 22,600 | 23,670 | 24,568 |
| Kivimaa–Kiveriö–Joutjärvi | 17,100 | 23,500 | 20,700 | 18,300 | 17,790 | 16,974 |
| Kärpänen | 9,400 | 7,600 | 12,800 | 12,700 | 11,940 | 11,612 |
| Ahtiala | 4,600 | 5,100 | 5,100 | 9,100 | 10,500 | 10,897 |
| Mukkula | 1,300 | 9,100 | 9,500 | 8,500 | 8,120 | 7,877 |
| Jalkaranta | 2,500 | 1,950 | 5,600 | 6,200 | 6,020 | 5,852 |
| Kolava–Kujala | 900 | 550 | 400 | 300 | 310 | 710 |
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