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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Watertown. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Watertown, South Dakota is approximatly 20237.
Racial profile for Watertown:
| White : | 19479 |
| Black : | 28 |
| Native American : | 333 |
| Asian : | 67 |
| Pacific Islander : | 4 |
| Other : | 144 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Watertown, South Dakota :
| 18 - 19 : | 379 |
| 20 : | 219 |
| 21 : | 161 |
| 22 - 24 : | 431 |
| 25 - 29 : | 704 |
| 30 - 34 : | 629 |
| 35 - 39 : | 740 |
| 40 - 44 : | 765 |
| 45 - 49 : | 765 |
| 50 - 54 : | 540 |
| 55 - 59 : | 384 |
| 60 - 61 : | 143 |
| 62 - 64 : | 205 |
| 65 - 66 : | 108 |
| 67 - 69 : | 185 |
| 70 - 74 : | 296 |
| 75 - 79 : | 307 |
| 80 - 84 : | 180 |
| 85+ : | 123 |
Population by age for females in Watertown, South Dakota :
| 18 - 19 : | 369 |
| 20 : | 176 |
| 21 : | 143 |
| 22 - 24 : | 409 |
| 25 - 29 : | 633 |
| 30 - 34 : | 597 |
| 35 - 39 : | 779 |
| 40 - 44 : | 797 |
| 45 - 49 : | 685 |
| 50 - 54 : | 533 |
| 55 - 59 : | 375 |
| 60 - 61 : | 157 |
| 62 - 64 : | 243 |
| 65 - 66 : | 141 |
| 67 - 69 : | 236 |
| 70 - 74 : | 413 |
| 75 - 79 : | 421 |
| 80 - 84 : | 290 |
| 85+ : | 339 |
The total amount of households in Watertown, South Dakota is 8385. With 19861 people of the population in these households. The average household size is 2.37.
15751 people in Watertown, South Dakota are part of a family. The average family size in Watertown is 2.98 people.
There are 3860 married families in Watertown, South Dakota.
Number of married families by number of members in the family :
| 0 - 2 : | 627 | 3 - 4 : | 381 | 5 : | 200 | 6 - 11 : | 1276 | 12 - 17 : | 1376 |