| Washington County | 1990 | Census 1990 | Single-Family Detached | 38484 |
| Washington County | 2000 | Census 2000 | Single-Family Detached | 54270 |
| Washington County | 2010 | Estimates 2010 | Single-Family Detached | 63329 |
| Washington County | 2020 | Estimates 2020 | Single-Family Detached | 73586 |
| Washington County | 2021 | Estimates 2021 | Single-Family Detached | 74626 |
| Washington County | 1990 | Census 1990 | Townhomes (single-family attached) | 3889 |
| Washington County | 2000 | Census 2000 | Townhomes (single-family attached) | 8669 |
| Washington County | 2010 | Estimates 2010 | Townhomes (single-family attached) | 13117 |
| Washington County | 2020 | Estimates 2020 | Townhomes (single-family attached) | 15941 |
| Washington County | 2021 | Estimates 2021 | Townhomes (single-family attached) | 16143 |
| Washington County | 1990 | Census 1990 | Duplex, triplex and quad | 2095 |
| Washington County | 2000 | Census 2000 | Duplex, triplex and quad | 2180 |
| Washington County | 2010 | Estimates 2010 | Duplex, triplex and quad | 2823 |
| Washington County | 2020 | Estimates 2020 | Duplex, triplex and quad | 806 |
| Washington County | 2021 | Estimates 2021 | Duplex, triplex and quad | 809 |
| Washington County | 1990 | Census 1990 | Multifamily (5 units or more) | 5429 |
| Washington County | 2000 | Census 2000 | Multifamily (5 units or more) | 7020 |
| Washington County | 2010 | Estimates 2010 | Multifamily (5 units or more) | 11743 |
| Washington County | 2020 | Estimates 2020 | Multifamily (5 units or more) | 12176 |
| Washington County | 2021 | Estimates 2021 | Multifamily (5 units or more) | 12709 |
| Washington County | 1990 | Census 1990 | Manufactured Home | 1475 |
| Washington County | 2000 | Census 2000 | Manufactured Home | 1472 |
| Washington County | 2010 | Estimates 2010 | Manufactured Home | 1362 |
| Washington County | 2020 | Estimates 2020 | Manufactured Home | 1470 |
| Washington County | 2021 | Estimates 2021 | Manufactured Home | 1411 |
| Washington County | 1990 | Census 1990 | Other (Boat, RV, etc.) | 276 |
| Washington County | 2000 | Census 2000 | Other (Boat, RV, etc.) | 24 |
| Washington County | 2010 | Estimates 2010 | Other (Boat, RV, etc.) | 0 |
| Washington County | 2020 | Estimates 2020 | Other (Boat, RV, etc.) | 30 |
| Washington County | 2021 | Estimates 2021 | Other (Boat, RV, etc.) | 30 |
| Washington County | 2020 | Estimates 2020 | Accessory Dwelling Unit | 5 |
| Washington County | 2021 | Estimates 2021 | Accessory Dwelling Unit | 8 |