South Dakota · United States
Castlewood population
636people · latest figure
Castlewood has a population of 636, making it the 8906th largest place we list in United States. It is in South Dakota.
Castlewood holds under a tenth of one per cent of United States's 349,035,494 people. New York City, the largest place we list there, is 13843 times its size.
636
population
#8,906
Castlewood is in South Dakota, which has 152 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Tyrone | New Mexico | 637 |
| Ririe | Idaho | 637 |
| Arlee | Montana | 636 |
| Selby | South Dakota | 634 |
| Clarkson | Nebraska | 633 |
| Elgin | North Dakota | 633 |
All places in United States → · South Dakota →
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.