| Castle Rock Township | 1990 | Census 1990 | Single-Family Detached | 435 |
| Castle Rock Township | 2000 | Census 2000 | Single-Family Detached | 464 |
| Castle Rock Township | 2010 | Estimates 2010 | Single-Family Detached | 519 |
| Castle Rock Township | 2020 | Estimates 2020 | Single-Family Detached | 494 |
| Castle Rock Township | 2023 | Estimates 2023 | Single-Family Detached | 503 |
| Castle Rock Township | 1990 | Census 1990 | Townhomes (single-family attached) | 3 |
| Castle Rock Township | 2000 | Census 2000 | Townhomes (single-family attached) | 5 |
| Castle Rock Township | 2010 | Estimates 2010 | Townhomes (single-family attached) | 0 |
| Castle Rock Township | 2020 | Estimates 2020 | Townhomes (single-family attached) | 0 |
| Castle Rock Township | 2023 | Estimates 2023 | Townhomes (single-family attached) | 0 |
| Castle Rock Township | 1990 | Census 1990 | Duplex, triplex and quad | 7 |
| Castle Rock Township | 2000 | Census 2000 | Duplex, triplex and quad | 13 |
| Castle Rock Township | 2010 | Estimates 2010 | Duplex, triplex and quad | 4 |
| Castle Rock Township | 2020 | Estimates 2020 | Duplex, triplex and quad | 26 |
| Castle Rock Township | 2023 | Estimates 2023 | Duplex, triplex and quad | 26 |
| Castle Rock Township | 1990 | Census 1990 | Multifamily (5 units or more) | 0 |
| Castle Rock Township | 2000 | Census 2000 | Multifamily (5 units or more) | 0 |
| Castle Rock Township | 2010 | Estimates 2010 | Multifamily (5 units or more) | 0 |
| Castle Rock Township | 2020 | Estimates 2020 | Multifamily (5 units or more) | 0 |
| Castle Rock Township | 2023 | Estimates 2023 | Multifamily (5 units or more) | 0 |
| Castle Rock Township | 1990 | Census 1990 | Manufactured Home | 21 |
| Castle Rock Township | 2000 | Census 2000 | Manufactured Home | 25 |
| Castle Rock Township | 2010 | Estimates 2010 | Manufactured Home | 0 |
| Castle Rock Township | 2020 | Estimates 2020 | Manufactured Home | 0 |
| Castle Rock Township | 2023 | Estimates 2023 | Manufactured Home | 0 |
| Castle Rock Township | 1990 | Census 1990 | Other (Boat, RV, etc.) | 2 |
| Castle Rock Township | 2000 | Census 2000 | Other (Boat, RV, etc.) | 0 |
| Castle Rock Township | 2010 | Estimates 2010 | Other (Boat, RV, etc.) | 0 |
| Castle Rock Township | 2020 | Estimates 2020 | Other (Boat, RV, etc.) | 0 |
| Castle Rock Township | 2023 | Estimates 2023 | Other (Boat, RV, etc.) | 0 |
| Castle Rock Township | 2020 | Estimates 2020 | Accessory Dwelling Unit | 0 |
| Castle Rock Township | 2023 | Estimates 2023 | Accessory Dwelling Unit | 0 |