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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Petersburg. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Petersburg, Illinois is approximatly 2299.
Racial profile for Petersburg:
| White : | 2248 |
| Black : | 25 |
| Native American : | 9 |
| Asian : | 5 |
| Pacific Islander : | 0 |
| Other : | 8 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Petersburg, Illinois :
| 18 - 19 : | 37 |
| 20 : | 20 |
| 21 : | 12 |
| 22 - 24 : | 26 |
| 25 - 29 : | 62 |
| 30 - 34 : | 76 |
| 35 - 39 : | 93 |
| 40 - 44 : | 62 |
| 45 - 49 : | 84 |
| 50 - 54 : | 63 |
| 55 - 59 : | 40 |
| 60 - 61 : | 14 |
| 62 - 64 : | 28 |
| 65 - 66 : | 17 |
| 67 - 69 : | 31 |
| 70 - 74 : | 32 |
| 75 - 79 : | 28 |
| 80 - 84 : | 18 |
| 85+ : | 23 |
Population by age for females in Petersburg, Illinois :
| 18 - 19 : | 38 |
| 20 : | 11 |
| 21 : | 9 |
| 22 - 24 : | 36 |
| 25 - 29 : | 69 |
| 30 - 34 : | 77 |
| 35 - 39 : | 104 |
| 40 - 44 : | 86 |
| 45 - 49 : | 65 |
| 50 - 54 : | 68 |
| 55 - 59 : | 58 |
| 60 - 61 : | 25 |
| 62 - 64 : | 31 |
| 65 - 66 : | 32 |
| 67 - 69 : | 31 |
| 70 - 74 : | 61 |
| 75 - 79 : | 44 |
| 80 - 84 : | 64 |
| 85+ : | 61 |
The total amount of households in Petersburg, Illinois is 997. With 2219 people of the population in these households. The average household size is 2.23.
1771 people in Petersburg, Illinois are part of a family. The average family size in Petersburg is 2.89 people.
There are 343 married families in Petersburg, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 45 | 3 - 4 : | 41 | 5 : | 23 | 6 - 11 : | 124 | 12 - 17 : | 110 |