City or Town Name

Population

County

Area of State

Has Post Office?

Has Railroad?

Has Express Office?

  Oak

 Pope

South

Yes 

No 

No 

Oakdale

Cook

Northeast

No

Yes

No

Oakdale

151

Washington

South

Yes

Yes

No

Oakford

164

Menard

Central

Yes

Yes

Yes

Oak Glen

300

Cook

Northeast

Yes

Yes

Yes

Oak Glen

Cook

Northeast

No

Yes

No

Oak Grove

26

McLean

Central

Yes

No

No

Oak Hill

150

Peoria

Central

Yes

Yes

Yes

Oakland

995

Coles

East

Yes

Yes

Yes

Oakland

Cook

Northeast

No

Yes

Yes

Oakland

St. Clair

Southwest

No

Yes

Yes

Oak Lawn

Cook

Northeast

Yes

Yes

Yes

Oakley

100

Macon

Central

Yes

Yes

Yes

Oak Mound

Fulton

North

Yes

Yes

Yes

Oak Park

4771

Cook

Northeast

Yes

Yes

Yes

Oak Point

30

Clark

East

Yes

No

No

Oaktown

150

Pulaski

South

Yes

Yes

Yes

Oakville

Union

South

Yes

No

No

Oakwood

99

Vermilion

East

Yes

Yes

Yes

Oak Woods

Cook

Northeast

No

Yes

No

Obed

Shelby

Central

Yes

No

No

Oblong

390

Crawford

Southeast

Yes

Yes

Yes

Oconee

332

Shelby

Central

Yes

Yes

Yes

Ocova

23

Livingston

Central

Yes

Yes

Yes

Odell

800

Livingston

Central

Yes

Yes

Yes

Odin

817

Marion

South

Yes

Yes

Yes

O'Fallon Depot

865

St. Clair

Southwest

Yes

Yes

Yes

O'Fallon Junction

St. Clair

Southwest

No

Yes

No

Ogden

334

Champaign

East

Yes

Yes

Yes

Ogle

Mercer

Northwest

Yes

Yes

No

Ogles

St. Clair

Southwest

No

Yes

Yes

Oglesby

LaSalle

North

Yes

Yes

Yes

Ohio

364

Bureau

North

Yes

Yes

Yes

Ohio & Mississippi Junction

Gallatin

Central

No

Yes

No

Ohlman

120

Montgomery

Central

Yes

Yes

Yes

Okawville

472

Washington

South

Yes

No

Yes

Oakville Station

Washington

South

No

Yes

No

Old Harmony

St. Clair

Southwest

Yes

No

No

Old Ripley

166

Bond

South

Yes

No

No

Olena

166

Henderson

West

Yes

No

No

Olga

Hamilton

South

Yes

No

No

Olive Branch

45

Alexander

South

Yes

No

No

Olive

Edgar

East

Yes

Yes

Yes

Olmstead

203

Pulaski

Southeast

Yes

Yes

Yes

OLNEY

3831

Richland

Southeast

Yes

Yes

Yes

Omaha

428

Gallatin

Southeast

Yes

Yes

Yes

Omega

84

Marion

South

Yes

No

No

Onarga

994

Iroquois

East

Yes

Yes

Yes

Oneco

88

Stephenson

Northwest

Yes

No

No

Oneida

699

Knox

West

Yes

Yes

Yes

Ontario

1225

Knox

West

Yes

No

No

Ontarioville

125

DuPage

Northeast

Yes

Yes

Yes

Opdyke

150

Jefferson

South

Yes

Yes

Yes

Opheim

112

Henry

Northwest

Yes

Yes

Yes

OQUAWKA

1100

Henderson

West

Yes

Yes

Yes

Ora

82

Jackson

South

Yes

Yes

Yes

Orange

Clark

East

Yes

No

No

Orange Prairie

Peoria

Central

Yes

No

No

Orangeville

347

Stephenson

Northwest

Yes

Yes

Yes

Oraville

125

Jackson

South

No

Yes

No

Orchard Mines

100

Peoria

Central

Yes

Yes

Yes

Orchard Place

Cook

Northeast

Yes

Yes

Yes

Orchardville

Wayne

South

Yes

No

No

Oreana

170

Macon

Central

Yes

Yes

Yes

OREGON

1566

Ogle

North

Yes

Yes

Yes

Orion

624

Henry

Northwest

Yes

Yes

Yes

Orland

175

Cook

Northeast

Yes

Yes

Yes

Orleans

38

Morgan

West

Yes

Yes

Yes

Ormond

Warren

West

No

Yes

No

Osage

38

Franklin

South

Yes

No

No

Osborn

26

Rock Island

Northwest

Yes

Yes

Yes

Osceola

99

Stark

Central

Yes

No

No

Osco

81

Henry

Northwest

Yes

Yes

Yes

Oskalosa

89

Clay

South

Yes

No

No

Osman

100

McLean

Central

Yes

Yes

Yes

Ospur

DeWitt

Central

No

Yes

No

Oswego

641

Kendall

North

Yes

Yes

Yes

OTTAWA

9985

LaSalle

North

Yes

Yes

Yes

Otter

LaSalle

North

Yes

No

No

Otterville

173

Jersey

West

Yes

No

No

Otto

Kankakee

East

No

Yes

Yes

Outer Depot

Cook

Northeast

No

Yes

No

Outten

Macon

Central

Yes

No

No

Ovington

Cook

Northeast

Yes

No

No

Owaneco

325

Christian

Central

Yes

Yes

Yes

Owen

Winnebago

North

Yes

No

No

Ox Bow

30

Putnam

North

Yes

No

No

Oxville

89

Scott

West

Yes

No

No

Ozark

Johnson

South

Yes

Yes

Yes