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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Keystone. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Keystone, Iowa is approximatly 687.
Racial profile for Keystone:
| White : | 683 |
| Black : | 1 |
| Native American : | 0 |
| Asian : | 0 |
| Pacific Islander : | 0 |
| Other : | 0 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Keystone, Iowa :
| 18 - 19 : | 9 |
| 20 : | 1 |
| 21 : | 7 |
| 22 - 24 : | 9 |
| 25 - 29 : | 13 |
| 30 - 34 : | 19 |
| 35 - 39 : | 30 |
| 40 - 44 : | 20 |
| 45 - 49 : | 20 |
| 50 - 54 : | 14 |
| 55 - 59 : | 11 |
| 60 - 61 : | 6 |
| 62 - 64 : | 5 |
| 65 - 66 : | 3 |
| 67 - 69 : | 6 |
| 70 - 74 : | 16 |
| 75 - 79 : | 15 |
| 80 - 84 : | 13 |
| 85+ : | 16 |
Population by age for females in Keystone, Iowa :
| 18 - 19 : | 10 |
| 20 : | 3 |
| 21 : | 6 |
| 22 - 24 : | 11 |
| 25 - 29 : | 9 |
| 30 - 34 : | 29 |
| 35 - 39 : | 22 |
| 40 - 44 : | 20 |
| 45 - 49 : | 13 |
| 50 - 54 : | 11 |
| 55 - 59 : | 14 |
| 60 - 61 : | 4 |
| 62 - 64 : | 8 |
| 65 - 66 : | 7 |
| 67 - 69 : | 12 |
| 70 - 74 : | 17 |
| 75 - 79 : | 27 |
| 80 - 84 : | 21 |
| 85+ : | 40 |
The total amount of households in Keystone, Iowa is 273. With 648 people of the population in these households. The average household size is 2.37.
533 people in Keystone, Iowa are part of a family. The average family size in Keystone is 3.05 people.
There are 143 married families in Keystone, Iowa.
Number of married families by number of members in the family :
| 0 - 2 : | 22 | 3 - 4 : | 8 | 5 : | 14 | 6 - 11 : | 51 | 12 - 17 : | 48 |