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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Quincy. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Quincy, Illinois is approximatly 40366.
Racial profile for Quincy:
| White : | 37550 |
| Black : | 1879 |
| Native American : | 75 |
| Asian : | 216 |
| Pacific Islander : | 5 |
| Other : | 147 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Quincy, Illinois :
| 18 - 19 : | 625 |
| 20 : | 328 |
| 21 : | 311 |
| 22 - 24 : | 732 |
| 25 - 29 : | 1220 |
| 30 - 34 : | 1176 |
| 35 - 39 : | 1316 |
| 40 - 44 : | 1379 |
| 45 - 49 : | 1260 |
| 50 - 54 : | 1150 |
| 55 - 59 : | 863 |
| 60 - 61 : | 304 |
| 62 - 64 : | 449 |
| 65 - 66 : | 257 |
| 67 - 69 : | 431 |
| 70 - 74 : | 769 |
| 75 - 79 : | 766 |
| 80 - 84 : | 524 |
| 85+ : | 383 |
Population by age for females in Quincy, Illinois :
| 18 - 19 : | 687 |
| 20 : | 344 |
| 21 : | 291 |
| 22 - 24 : | 715 |
| 25 - 29 : | 1235 |
| 30 - 34 : | 1239 |
| 35 - 39 : | 1471 |
| 40 - 44 : | 1391 |
| 45 - 49 : | 1323 |
| 50 - 54 : | 1214 |
| 55 - 59 : | 1034 |
| 60 - 61 : | 331 |
| 62 - 64 : | 527 |
| 65 - 66 : | 368 |
| 67 - 69 : | 524 |
| 70 - 74 : | 1063 |
| 75 - 79 : | 1042 |
| 80 - 84 : | 833 |
| 85+ : | 1063 |
The total amount of households in Quincy, Illinois is 16546. With 38002 people of the population in these households. The average household size is 2.30.
29708 people in Quincy, Illinois are part of a family. The average family size in Quincy is 2.94 people.
There are 6039 married families in Quincy, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 891 | 3 - 4 : | 586 | 5 : | 341 | 6 - 11 : | 2062 | 12 - 17 : | 2159 |