Places beginning with LO in Illinois, United States
- Loami
- Loami, Township of
- Lochanora
- Lockhaven
- Lockport
- Lockport, Township of
- Locks (subdivision)
- Locust Grove (historical)
- Locust, Township of
- Loda
- Loda, Township of
- Lodemia
- Lodge
- Logan
- Logan County
- Logan Election Precinct
- Logansburgh (historical)
- Logansport (historical)
- Logan Square (subdivision)
- Logan, Township of
- Log Cabin Camp
- Lomax
- Lomax, Township of
- Lombard
- Lombard Tree (subdivision)
- Lombardville
- London Mills
- Lone Grove, Township of
- Lonesome Acres (subdivision)
- Lone Tree
- Lone Tree Corners
- Long Branch
- Long Branch
- Long Branch, Township of
- Long Creek
- Long Creek, Township of
- Long Grove
- Long Grove Valley (subdivision)
- Long Lake
- Long Point
- Long Point, Township of
- Long Shore Park
- Longview
- Longview Estates
- Longview Place (subdivision)
- Loogootee
- Looking Glass, Township of
- Loon Lake
- Loose Pulley Junction
- Loraine
- Loraine, Township of
- Loran
- Loran, Township of
- Lorenzo
- Loretto
- Lori-Sue Subdivision
- Lostant
- Lost Nation
- Lotus
- Lotus Woods
- Loudon, Township of
- Louisville
- Louisville, Township of
- Love
- Lovejoy, Township of
- Loves Corner
- Loves Park
- Love, Township of
- Lovilla
- Lovington
- Lovington, Township of
- Lowder
- Lowell
- Lower West Side (subdivision)
- Lowe, Township of
- Low Point
- Loxa
- Loyd