OA — JACKSONVILLE, NC

OAB — MOAB, UT

OAK — OAKLAND, CA

OAL — COALDALE, NV

OBH — WOLBACH, NE

OBK — NORTHBROOK, IL

OBN — OBLEON, HAITI

OC — NACOGDOCHES, TX

OCC — YAKUTAT, AK

OCF — OCALA, FL

OCN — OCEANSIDE, CA

OCS — ROCK SPRINGS, WY

ODF — TOCCOA, SC

ODG — ENID, OK

ODI — NODINE, MN

ODK — KODIAK, AK

ODR — ROANOKE, VA

ODX — ORD, NE

OED — MEDFORD, OR

OFF — OMAHA, NE

OFK — NORFOLK, NE

OG — OGDENSBURG, NY

OGD — OGDEN, UT

OGG — KAHULUI, HI

OHY — CORDELE, GA

OI — JACKSON, NE

OIN — OBERLIN, KS

OKC — OKLAHOMA CITY, OK

OKK — KOKOMO, IN

OKM — OKMULGEE, OK

OKS — OSHKOSH, NE

OKW — BROOKWOOD, AL

OLK — WOLF LAKE, IN

OLM — OLYMPIA, WA

OLS — NOGALES, AZ

OLT — SOLDOTNA, AK

OLU — COLUMBUS, NE

OLY — OLNEY-NOBLE, IL

OMA — OMAHA, NE

OME — NOME, AK

OMN — ORMOND BEACH, FL

ONL — O'NEILL, NE

ONM — SOCORRO, NM

ONP — NEWPORT, OR

OOC — NATCHITOCHES, LA

OOD — WOODSTOWN, NJ

OOM — BLOOMINGTON, IN

OP — THOMASTON, GA

OQA — REIDSVILLE, NC

OQK — NOATAK, AK

ORF — NORFOLK, VA

ORH — WORCESTER, MA

ORL — ORLANDO, FL

ORT — NORTHWAY, AK

ORW — NORWICH, CT

OS — COLUMBUS, OH

OS — OSHKOSH, WI

OSE — BETHEL, AK

OSH — OSHKOSH, WI

OSI — WOODSIDE, CA

OSW — OSWEGO, KS

OT — WORTHINGTON, MN

OTB — TUPELO, MS

OTG — WORTHINGTON, MN

OTH — NORTH BEND, OR

OTK — VALDOSTA, GA

OTM — OTTUMWA, IA

OTO — OTTO, NM

OTT — NOTTINGHAM, MD

OTZ — KOTZEBUE, AK

OVR — MINEOLA, IA

OW — NORWOOD, MA

OWB — OWENSBORO, KY

OWC — DOUGLAS, GA

OXI — KNOX, IN

OZ — FORT NOVOSEL(OZARK), AL

OZB — COZAD, NE

OZR — FORT NOVOSEL (OZARK), AL