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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of St. Joseph. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for St. Joseph, Illinois is approximatly 2912.
Racial profile for St. Joseph:
| White : | 2880 |
| Black : | 3 |
| Native American : | 2 |
| Asian : | 7 |
| Pacific Islander : | 0 |
| Other : | 7 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in St. Joseph, Illinois :
| 18 - 19 : | 49 |
| 20 : | 16 |
| 21 : | 8 |
| 22 - 24 : | 29 |
| 25 - 29 : | 73 |
| 30 - 34 : | 119 |
| 35 - 39 : | 137 |
| 40 - 44 : | 134 |
| 45 - 49 : | 114 |
| 50 - 54 : | 86 |
| 55 - 59 : | 52 |
| 60 - 61 : | 22 |
| 62 - 64 : | 33 |
| 65 - 66 : | 20 |
| 67 - 69 : | 29 |
| 70 - 74 : | 29 |
| 75 - 79 : | 27 |
| 80 - 84 : | 8 |
| 85+ : | 15 |
Population by age for females in St. Joseph, Illinois :
| 18 - 19 : | 22 |
| 20 : | 14 |
| 21 : | 10 |
| 22 - 24 : | 36 |
| 25 - 29 : | 89 |
| 30 - 34 : | 108 |
| 35 - 39 : | 154 |
| 40 - 44 : | 146 |
| 45 - 49 : | 113 |
| 50 - 54 : | 93 |
| 55 - 59 : | 58 |
| 60 - 61 : | 27 |
| 62 - 64 : | 24 |
| 65 - 66 : | 22 |
| 67 - 69 : | 30 |
| 70 - 74 : | 36 |
| 75 - 79 : | 38 |
| 80 - 84 : | 33 |
| 85+ : | 30 |
The total amount of households in St. Joseph, Illinois is 1125. With 2906 people of the population in these households. The average household size is 2.58.
2533 people in St. Joseph, Illinois are part of a family. The average family size in St. Joseph is 3.03 people.
There are 674 married families in St. Joseph, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 110 | 3 - 4 : | 79 | 5 : | 36 | 6 - 11 : | 224 | 12 - 17 : | 225 |