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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Underwood. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Underwood, Iowa is approximatly 688.
Racial profile for Underwood:
| White : | 683 |
| Black : | 0 |
| Native American : | 0 |
| Asian : | 1 |
| Pacific Islander : | 0 |
| Other : | 4 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Underwood, Iowa :
| 18 - 19 : | 7 |
| 20 : | 8 |
| 21 : | 5 |
| 22 - 24 : | 8 |
| 25 - 29 : | 13 |
| 30 - 34 : | 21 |
| 35 - 39 : | 24 |
| 40 - 44 : | 28 |
| 45 - 49 : | 24 |
| 50 - 54 : | 15 |
| 55 - 59 : | 14 |
| 60 - 61 : | 9 |
| 62 - 64 : | 4 |
| 65 - 66 : | 5 |
| 67 - 69 : | 7 |
| 70 - 74 : | 4 |
| 75 - 79 : | 3 |
| 80 - 84 : | 1 |
| 85+ : | 2 |
Population by age for females in Underwood, Iowa :
| 18 - 19 : | 15 |
| 20 : | 5 |
| 21 : | 5 |
| 22 - 24 : | 18 |
| 25 - 29 : | 24 |
| 30 - 34 : | 21 |
| 35 - 39 : | 31 |
| 40 - 44 : | 35 |
| 45 - 49 : | 21 |
| 50 - 54 : | 18 |
| 55 - 59 : | 14 |
| 60 - 61 : | 10 |
| 62 - 64 : | 8 |
| 65 - 66 : | 4 |
| 67 - 69 : | 7 |
| 70 - 74 : | 7 |
| 75 - 79 : | 11 |
| 80 - 84 : | 7 |
| 85+ : | 9 |
The total amount of households in Underwood, Iowa is 258. With 688 people of the population in these households. The average household size is 2.67.
582 people in Underwood, Iowa are part of a family. The average family size in Underwood is 3.27 people.
There are 158 married families in Underwood, Iowa.
Number of married families by number of members in the family :
| 0 - 2 : | 22 | 3 - 4 : | 15 | 5 : | 7 | 6 - 11 : | 52 | 12 - 17 : | 62 |