Places beginning with MO in South Dakota, United States
- Mobridge
- Mobridge, City of
- Modena, Township of
- Moe
- Moenville
- Molan, Township of
- Mondamin, Township of
- Monroe
- Monroe, Town of
- Monroe, Township of
- Monroe, Township of
- Montpelier, Township of
- Montrose
- Montrose, City of
- Montrose, Township of
- Moody County
- Moon
- Moore, Township of
- Moore, Township of
- Moreau
- Moreau, Township of
- Morgan, Township of
- Moritz
- Morningside
- Morningside, Township of
- Morreau (historical), Township of
- Morristown
- Morristown, Town of
- Morton, Township of
- Morton, Township of
- Moscow, Township of
- Mosher
- Mosher, Township of
- Moss Agate (historical), Township of
- Mound City
- Mound City, Town of
- Mound City, Township of
- Mountain (historical), Township of
- Mount Pleasant, Township of
- Mount Rushmore, Unorganized Territory of
- Mount Vernon
- Mount Vernon, City of
- Mount Vernon, Township of