| Watertown | 1990 | Census 1990 | Single-Family Detached | 495 |
| Watertown | 2000 | Census 2000 | Single-Family Detached | 713 |
| Watertown | 2010 | Estimates 2010 | Single-Family Detached | 1083 |
| Watertown | 2020 | Estimates 2020 | Single-Family Detached | 1330 |
| Watertown | 2023 | Estimates 2023 | Single-Family Detached | 1413 |
| Watertown | 1990 | Census 1990 | Townhomes (single-family attached) | 33 |
| Watertown | 2000 | Census 2000 | Townhomes (single-family attached) | 38 |
| Watertown | 2010 | Estimates 2010 | Townhomes (single-family attached) | 173 |
| Watertown | 2020 | Estimates 2020 | Townhomes (single-family attached) | 23 |
| Watertown | 2023 | Estimates 2023 | Townhomes (single-family attached) | 47 |
| Watertown | 1990 | Census 1990 | Duplex, triplex and quad | 54 |
| Watertown | 2000 | Census 2000 | Duplex, triplex and quad | 41 |
| Watertown | 2010 | Estimates 2010 | Duplex, triplex and quad | 74 |
| Watertown | 2020 | Estimates 2020 | Duplex, triplex and quad | 18 |
| Watertown | 2023 | Estimates 2023 | Duplex, triplex and quad | 18 |
| Watertown | 1990 | Census 1990 | Multifamily (5 units or more) | 145 |
| Watertown | 2000 | Census 2000 | Multifamily (5 units or more) | 139 |
| Watertown | 2010 | Estimates 2010 | Multifamily (5 units or more) | 193 |
| Watertown | 2020 | Estimates 2020 | Multifamily (5 units or more) | 235 |
| Watertown | 2023 | Estimates 2023 | Multifamily (5 units or more) | 235 |
| Watertown | 1990 | Census 1990 | Manufactured Home | 180 |
| Watertown | 2000 | Census 2000 | Manufactured Home | 176 |
| Watertown | 2010 | Estimates 2010 | Manufactured Home | 174 |
| Watertown | 2020 | Estimates 2020 | Manufactured Home | 166 |
| Watertown | 2023 | Estimates 2023 | Manufactured Home | 171 |
| Watertown | 1990 | Census 1990 | Other (Boat, RV, etc.) | 8 |
| Watertown | 2000 | Census 2000 | Other (Boat, RV, etc.) | 0 |
| Watertown | 2010 | Estimates 2010 | Other (Boat, RV, etc.) | 0 |
| Watertown | 2020 | Estimates 2020 | Other (Boat, RV, etc.) | 0 |
| Watertown | 2023 | Estimates 2023 | Other (Boat, RV, etc.) | 0 |
| Watertown | 2020 | Estimates 2020 | Accessory Dwelling Unit | 0 |
| Watertown | 2023 | Estimates 2023 | Accessory Dwelling Unit | 0 |