OAKLAND, CA — OAK

OBERLIN, KS — OIN

OBION, TN — UC

OBLEON, HAITI — OBN

OCALA, FL — OCF

OCEAN CAPE, AK — OCC

OCEANA, VA — NTU

OCEANSIDE, CA — OCN

OFFUTT, NE — OFF

OGDEN, UT — OGD

OGIVE, NY — OG

OILLR, OK — TU

OKLAHOMA WILL RGS W, OK — OKC

OKMULGEE, OK — OKM

OLD CROW, CANADA — YOC

OLNEY, IL — OLY

OLSTE, MI — MB

OLYMPIA, WA — OLM

OMAHA, IA — OVR

OMAHA, NE — OMA

O'NEILL, NE — ONL

ONIDA, OH — MW

ONYUN, GA — UQN

ORANGE GROVE, TX — NOG

ORCA BAY, AK — ALJ

ORD, NE — ODX

ORLANDO, FL — ORL

ORMOND BEACH, FL — OMN

OSCARVILLE, AK — OSE

OSHKOSH, NE — OKS

OSHKOSH, WI — OSH

OSWEGO, KS — OSW

OTTAWA, CANADA — YOW

OTTO, NM — OTO

OTTUMWA, IA — OTM

OWENSBORO, KY — OWB

OXONN, DC — DCA