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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Johnston. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Johnston, Iowa is approximatly 8649.
Racial profile for Johnston:
| White : | 8320 |
| Black : | 50 |
| Native American : | 9 |
| Asian : | 173 |
| Pacific Islander : | 0 |
| Other : | 42 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Johnston, Iowa :
| 18 - 19 : | 88 |
| 20 : | 26 |
| 21 : | 28 |
| 22 - 24 : | 90 |
| 25 - 29 : | 212 |
| 30 - 34 : | 310 |
| 35 - 39 : | 415 |
| 40 - 44 : | 385 |
| 45 - 49 : | 377 |
| 50 - 54 : | 311 |
| 55 - 59 : | 173 |
| 60 - 61 : | 59 |
| 62 - 64 : | 57 |
| 65 - 66 : | 43 |
| 67 - 69 : | 60 |
| 70 - 74 : | 90 |
| 75 - 79 : | 66 |
| 80 - 84 : | 33 |
| 85+ : | 37 |
Population by age for females in Johnston, Iowa :
| 18 - 19 : | 72 |
| 20 : | 26 |
| 21 : | 19 |
| 22 - 24 : | 104 |
| 25 - 29 : | 228 |
| 30 - 34 : | 331 |
| 35 - 39 : | 445 |
| 40 - 44 : | 409 |
| 45 - 49 : | 387 |
| 50 - 54 : | 273 |
| 55 - 59 : | 189 |
| 60 - 61 : | 49 |
| 62 - 64 : | 77 |
| 65 - 66 : | 48 |
| 67 - 69 : | 65 |
| 70 - 74 : | 132 |
| 75 - 79 : | 115 |
| 80 - 84 : | 104 |
| 85+ : | 149 |
The total amount of households in Johnston, Iowa is 3216. With 8380 people of the population in these households. The average household size is 2.61.
7250 people in Johnston, Iowa are part of a family. The average family size in Johnston is 3.13 people.
There are 2170 married families in Johnston, Iowa.
Number of married families by number of members in the family :
| 0 - 2 : | 324 | 3 - 4 : | 238 | 5 : | 133 | 6 - 11 : | 770 | 12 - 17 : | 705 |