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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Onawa. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Onawa, Iowa is approximatly 3091.
Racial profile for Onawa:
| White : | 3025 |
| Black : | 1 |
| Native American : | 36 |
| Asian : | 6 |
| Pacific Islander : | 1 |
| Other : | 1 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Onawa, Iowa :
| 18 - 19 : | 35 |
| 20 : | 8 |
| 21 : | 9 |
| 22 - 24 : | 39 |
| 25 - 29 : | 73 |
| 30 - 34 : | 85 |
| 35 - 39 : | 114 |
| 40 - 44 : | 101 |
| 45 - 49 : | 98 |
| 50 - 54 : | 82 |
| 55 - 59 : | 80 |
| 60 - 61 : | 23 |
| 62 - 64 : | 36 |
| 65 - 66 : | 37 |
| 67 - 69 : | 46 |
| 70 - 74 : | 68 |
| 75 - 79 : | 56 |
| 80 - 84 : | 50 |
| 85+ : | 43 |
Population by age for females in Onawa, Iowa :
| 18 - 19 : | 29 |
| 20 : | 14 |
| 21 : | 15 |
| 22 - 24 : | 39 |
| 25 - 29 : | 92 |
| 30 - 34 : | 76 |
| 35 - 39 : | 110 |
| 40 - 44 : | 104 |
| 45 - 49 : | 88 |
| 50 - 54 : | 77 |
| 55 - 59 : | 87 |
| 60 - 61 : | 40 |
| 62 - 64 : | 45 |
| 65 - 66 : | 29 |
| 67 - 69 : | 52 |
| 70 - 74 : | 98 |
| 75 - 79 : | 95 |
| 80 - 84 : | 87 |
| 85+ : | 125 |
The total amount of households in Onawa, Iowa is 1329. With 2986 people of the population in these households. The average household size is 2.25.
2303 people in Onawa, Iowa are part of a family. The average family size in Onawa is 2.89 people.
There are 492 married families in Onawa, Iowa.
Number of married families by number of members in the family :
| 0 - 2 : | 73 | 3 - 4 : | 46 | 5 : | 26 | 6 - 11 : | 168 | 12 - 17 : | 179 |