United States Counties (O-R)
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- Ohio (ARRL: OH)
- Adams County
- Allen County
- Ashland County
- Ashtabula County
- Athens County
- Auglaize County
- Belmont County
- Brown County
- Butler County
- Carroll County
- Champaign County
- Clark County
- Clermont County
- Clinton County
- Columbiana County
- Coshocton County
- Crawford County
- Cuyahoga County
- Darke County
- Defiance County
- Delaware County
- Erie County
- Fairfield County
- Fayette County
- Franklin County
- Fulton County
- Gallia County
- Geauga County
- Greene County
- Guernsey County
- Hamilton County
- Hancock County
- Hardin County
- Harrison County
- Henry County
- Highland County
- Hocking County
- Holmes County
- Huron County
- Jackson County
- Jefferson County
- Knox County
- Lake County
- Lawrence County
- Licking County
- Logan County
- Lorain County
- Lucas County
- Madison County
- Mahoning County
- Marion County
- Medina County
- Meigs County
- Mercer County
- Miami County
- Monroe County
- Montgomery County
- Morgan County
- Morrow County
- Muskingum County
- Noble County
- Ottawa County
- Paulding County
- Perry County
- Pickaway County
- Pike County
- Portage County
- Preble County
- Putnam County
- Richland County
- Ross County
- Sandusky County
- Scioto County
- Seneca County
- Shelby County
- Stark County
- Summit County
- Trumbull County
- Tuscarawas County
- Union County
- Van Wert County
- Vinton County
- Warren County
- Washington County
- Wayne County
- Williams County
- Wood County
- Wyandot County
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- Oklahoma (ARRL: OK)
- Adair County
- Alfalfa County
- Atoka County
- Beaver County
- Beckham County
- Blaine County
- Bryan County
- Caddo County
- Canadian County
- Carter County
- Cherokee County
- Choctaw County
- Cimarron County
- Cleveland County
- Coal County
- Comanche County
- Cotton County
- Craig County
- Creek County
- Custer County
- Delaware County
- Dewey County
- Ellis County
- Garfield County
- Garvin County
- Grady County
- Grant County
- Greer County
- Harmon County
- Harper County
- Haskell County
- Hughes County
- Jackson County
- Jefferson County
- Johnston County
- Kay County
- Kingfisher County
- Kiowa County
- Latimer County
- Le Flore County
- Lincoln County
- Logan County
- Love County
- Major County
- Marshall County
- Mayes County
- McClain County
- McCurtain County
- McIntosh County
- Murray County
- Muskogee County
- Noble County
- Nowata County
- Okfuskee County
- Oklahoma County
- Okmulgee County
- Osage County
- Ottawa County
- Pawnee County
- Payne County
- Pittsburg County
- Pontotoc County
- Pottawatomie County
- Pushmataha County
- Roger Mills County
- Rogers County
- Seminole County
- Sequoyah County
- Stephens County
- Texas County
- Tillman County
- Tulsa County
- Wagoner County
- Washington County
- Washita County
- Woods County
- Woodward County
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- Oregon (ARRL: OR)
- Baker County
- Benton County
- Clackamas County
- Clatsop County
- Columbia County
- Coos County
- Crook County
- Curry County
- Deschutes County
- Douglas County
- Gilliam County
- Grant County
- Harney County
- Hood River County
- Jackson County
- Jefferson County
- Josephine County
- Klamath County
- Lake County
- Lane County
- Lincoln County
- Linn County
- Malheur County
- Marion County
- Morrow County
- Multnomah County
- Polk County
- Sherman County
- Tillamook County
- Umatilla County
- Union County
- Wallowa County
- Wasco County
- Washington County
- Wheeler County
- Yamhill County
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- Pennsylvania (ARRL: EPA, WPA)
- Adams County
(ADA)
- Allegheny County
(ALL)
- Armstrong County
(ARM)
- Beaver County
(BEA)
- Bedford County
(BED)
- Berks County
(BER)
- Blair County
(BLA)
- Bradford County
(BRA)
- Bucks County
(BUX)
- Butler County
(BUT)
- Cambria County
(CMB)
- Cameron County
(CRN)
- Carbon County
(CAR)
- Centre County
(CEN)
- Chester County
(CHE)
- Clarion County
(CLA)
- Clearfield County
(CLE)
- Clinton County
(CLI)
- Columbia County
(COL)
- Crawford County
(CRA)
- Cumberland County
(CUM)
- Dauphin County
(DAU)
- Delaware County
(DCO)
- Elk County
(ELK)
- Erie County
(ERI)
- Fayette County
(FAY)
- Forest County
(FOR)
- Franklin County
(FRA)
- Fulton County
(FUL)
- Greene County
(GRE)
- Huntingdon County
(HUN)
- Indiana County
(INN)
- Jefferson County
(JEF)
- Juniata County
(JUN)
- Lackawanna County
(LAC)
- Lancaster County
(LAN)
- Lawrence County
(LAW)
- Lebanon County
(LEB)
- Lehigh County
(LEH)
- Luzerne County
(LUZ)
- Lycoming County
(LYX)
- McKean County
(MCK)
- Mercer County
(MER)
- Mifflin County
(MIF)
- Monroe County
(MOE)
- Montgomery County
(MGY)
- Montour County
(MTR)
- Northampton County
(NHA)
- Northumberland County
(NUM)
- Perry County
(PER)
- Philadelphia County
(PHI)
- Pike County
(PIK)
- Potter County
(POT)
- Schuylkill County
(SCH)
- Snyder County
(SNY)
- Somerset County
(SOM)
- Sullivan County
(SUL)
- Susquehanna County
(SUS)
- Tioga County
(TIO)
- Union County
(UNI)
- Venango County
(VEN)
- Warren County
(WAR)
- Washington County
(WAS)
- Wayne County
(WAY)
- Westmoreland County
(WES)
- Wyoming County
(WYO)
- York County
(YOR)
[NG3K Home][States][A-C][D-H][I-K][L-M][N][O-R][S-U][V-W]
- Rhode Island (ARRL: RI)
- Bristol County
- Kent County
- Newport County
- Providence County
- Washington County
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