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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Monmouth. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Monmouth, Illinois is approximatly 9841.
Racial profile for Monmouth:
| White : | 9125 |
| Black : | 276 |
| Native American : | 23 |
| Asian : | 46 |
| Pacific Islander : | 19 |
| Other : | 188 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Monmouth, Illinois :
| 18 - 19 : | 291 |
| 20 : | 166 |
| 21 : | 122 |
| 22 - 24 : | 212 |
| 25 - 29 : | 279 |
| 30 - 34 : | 275 |
| 35 - 39 : | 319 |
| 40 - 44 : | 311 |
| 45 - 49 : | 333 |
| 50 - 54 : | 278 |
| 55 - 59 : | 189 |
| 60 - 61 : | 60 |
| 62 - 64 : | 111 |
| 65 - 66 : | 57 |
| 67 - 69 : | 88 |
| 70 - 74 : | 138 |
| 75 - 79 : | 126 |
| 80 - 84 : | 75 |
| 85+ : | 58 |
Population by age for females in Monmouth, Illinois :
| 18 - 19 : | 317 |
| 20 : | 189 |
| 21 : | 153 |
| 22 - 24 : | 229 |
| 25 - 29 : | 264 |
| 30 - 34 : | 284 |
| 35 - 39 : | 315 |
| 40 - 44 : | 322 |
| 45 - 49 : | 343 |
| 50 - 54 : | 264 |
| 55 - 59 : | 224 |
| 60 - 61 : | 75 |
| 62 - 64 : | 125 |
| 65 - 66 : | 65 |
| 67 - 69 : | 111 |
| 70 - 74 : | 222 |
| 75 - 79 : | 225 |
| 80 - 84 : | 161 |
| 85+ : | 200 |
The total amount of households in Monmouth, Illinois is 3688. With 8731 people of the population in these households. The average household size is 2.37.
6940 people in Monmouth, Illinois are part of a family. The average family size in Monmouth is 2.99 people.
There are 1460 married families in Monmouth, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 199 | 3 - 4 : | 150 | 5 : | 79 | 6 - 11 : | 501 | 12 - 17 : | 531 |