Regions of United States
- Orr Branch
- Orphir School (historical)
- Orr Cemetery
- Orr Creek
- Orr Cemetery
- Orr Estates Lake
- Orr Estates Pond
- Orr School (historical)
- Orrs Gin (historical)
- Orrs Lake
- Orrs Lake Dam
- Orrville
- Orrville
- Orrville Amish Mennonite Church
- Orrville Baptist Church
- Orrville Cemetery
- Ortiz Siding
- Orvin Lookout Tower
- Osage Bar
- Osage Woodyard Landing
- Osaka
- Osaka Church
- Osanippa
- Osanippa Church
- Osanippa Creek
- Orr Estates
- Osborn Branch
- Osborn
- Osborn Creek
- Osborn Cemetery
- Osborn Creek
- Osborn Hill Cemetery
- Osborne Lake
- Osborne Lake
- Osborne Lake Dam
- Osburn Cemetery
- Oscar Cobb Dam
- Oscar Cobb Lake
- Oscar McGuffs Mine
- Oscar Underwood Bridge
- Oscar W Adams Elementary School
- Osborne Dam
- Osierfield School (historical)
- Osment Pond
- Osotchi (historical)
- Ostette Dam
- Oswall Creek
- Osierfield
- Oswalt Cemetery
- Oswayo Number 3 Mine
- Osways Mine
- Oswichee
- Oswichee Bridge
- Oswichee Cemetery
- Oswichee Baptist Church
- Otho
- Otho Branch
- Oswalt (historical)
- Otis Barfield Dam
- Oto Post Office (historical)
- Otter Bayou
- Otipalin (historical)
- Otter Branch
- Otter Creek
- Otter Pond
- Ottery Creek
- Ottery
- Our Lady Queen of Mercy Church
- Our Lady Queen of the Universe Catholic Church
- Our Lady of Fatima Church
- Our Lady of Fatima School
- Our Lady of Lourdes Catholic Church
- Our Lady of Lourdes School
- Our Lady of Mercy School
- Our Lady of Mount Carmel Church
- Our Lady of Sorrows Catholic Church (historical)
- Our Lady of Sorrows Church
- Our Lady of Sorrows Church
- Our Lady of Sorrows School
- Our Lady of the Gulf Catholic Church
- Our Lady of the Lake Church
- Our Lady of the Shoals Catholic Church
- Our Mother of Mercy Catholic Church
- Our Redeemer Lutheran Church
- Our Savior Lutheran Church
- Our Town
- Ourtown School (historical)
- Ousley Branch
- Ottis Burrow Dam
- Outlaw Spring
- Outlaw Spring Branch
- Ousley Store (historical)
- Outreach Endtime Deliverance Church
- Oven Bluff
- Oven Bluff Fishing Camp
- Oven Landing
- Overbrook
- Overbrook Estates
- Overlook
- Overlook
- Overlook Baptist Church
- Overlook Christian Church
- Overlook Church
- Overlook Estates
- Overlook Presbyterian Church
- Overlook Village Shopping Center
- Overstreet Cemetery
- Overton
- Overton Bridge
- Overton Cemetery
- Overton Cemetery
- Overton Dam
- Overton Elementary School
- Overton Gap
- Overton Heights
- Overton Lake
- Overton Lake
- Overton Manor
- Overton Mine
- Overton Number 1 Slope Mine
- Overton Park
- Overton School (historical)
- Overton Village Shopping Center
- Owassa
- Owen Branch
- Outreach Church
- Owen Branch
- Owen Branch
- Owen Chapel
- Owen Creek
- Owen Crossroads Church of God
- Owen Ford
- Owen Kenan Dam
- Owen Kenan Lake
- Owen Mountain
- Owens
- Owens
- Owens Bar
- Owens Bayou
- Owen Crossroads First Methodist Church
- Owens Branch
- Owens Bridge
- Owens Cemetery
- Owens Cemetery
- Owens Cemetery
- Owens Cemetery
- Owens Cemetery
- Owens Chapel Missionary Baptist Church
- Owens Chapel
- Owens Chapel Church
- Owens Creek
- Owens Cemetery
- Owens Cross Roads Middle School
- Owens Cross Roads Post Office
- Owens Dam
- Owens Elementary School
- Owens Ferry (historical)
- Owens Gap
- Owens Junior High School
- Owens Lake
- Owens Landing
- Owens Mill (historical)
- Owens Mill (historical)
- Owens Mountain
- Owens Pond
- Owens School (historical)
- Owens School Park
- Owensby Lake Number One
- Owensby Number One Dam
- Owenton
- Owl Creek
- Owl Creek
- Owl Creek
- Owens Cross Roads
- Owl Creek Horse Camp
- Owl Hill
- Owl Hollow
- Owl Creek
- Owl Hollow
- Owl Hollow
- Ox Level
- Oxanna
- Oxbow Bend
- Oxford
- Oxford Church of Christ
- Oxford Church
- Oxford Church of Christ
- Oxford Civic Center
- Oxford Elementary School
- Oxford Gate
- Oxford High School
- Oxford Lake
- Oxford Memorial Gardens Cemetery
- Oxford School (historical)
- Oxford School (historical)
- Oxford Stadium
- Oxhead Branch
- Ox Level Cemetery
- Oxmoor United Methodist Church
- Oxmoor Elementary School