
Long Hollow
- County:
- Marshall County
- County Seat:
- No
- Area (mi²):
- 14.432
- State:
- South Dakota
Long Hollow is a CDP located in Marshall County, South Dakota. Long Hollow has a 2025 population of 407. Long Hollow is currently growing at a rate of 3.56% annually and its population has increased by 3.04% since the most recent census, which recorded a population of 395 in 2020.
The average household income in Long Hollow is $42,609 with a poverty rate of 56.36%. The median age in Long Hollow is 7.9 years: 2.7 years for males, and 17.2 years for females.