| | Jasper County | MS | 28061 | | Laurel, MS 29860 | Hattiesburg-Laurel, MS 279 | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=JasperCounty+MS |
| | Jefferson County | MS | 28063 | | Natchez, MS-LA 35020 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=JeffersonCounty+MS |
| | Jefferson Davis County | MS | 28065 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=JeffersonDavisCounty+MS |
| | Jones County | MS | 28067 | | Laurel, MS 29860 | Hattiesburg-Laurel, MS 279 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=JonesCounty+MS |
| | Kemper County | MS | 28069 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=KemperCounty+MS |
| | Lafayette County | MS | 28071 | | Oxford, MS 37060 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=LafayetteCounty+MS |
| | Lamar County | MS | 28073 | | Hattiesburg, MS 25620 | Hattiesburg-Laurel, MS 279 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=LamarCounty+MS |
| | Lauderdale County | MS | 28075 | | Meridian, MS 32940 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LauderdaleCounty+MS |
| | Lawrence County | MS | 28077 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LawrenceCounty+MS |
| | Leake County | MS | 28079 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=LeakeCounty+MS |