List of counties Na-Pa
- Nassau County, NY (New York) - pop. 1,334,544
- Natchitoches Parish, LA (Louisiana) - pop. 39,080
- Natrona County, WY (Wyoming) - pop. 66,533
- Navajo County, AZ (Arizona) - pop. 97,470
- Navarro County, TX (Texas) - pop. 45,124
- Nelson County, KY (Kentucky) - pop. 37,477
- Nelson County, ND (North Dakota) - pop. 3,715
- Nelson County, VA (Virginia) - pop. 14,445
- Nemaha County, KS (Kansas) - pop. 10,717
- Nemaha County, NE (Nebraska) - pop. 7,576
- Neosho County, KS (Kansas) - pop. 16,997
- Neshoba County, MS (Mississippi) - pop. 28,684
- Ness County, KS (Kansas) - pop. 3,454
- Nevada County, AR (Arkansas) - pop. 9,955
- Nevada County, CA (California) - pop. 92,033
- New Castle County, DE (Delaware) - pop. 500,265
- New Hanover County, NC (North Carolina) - pop. 160,307
- New Haven County, CT (Connecticut) - pop. 824,008
- New Kent County, VA (Virginia) - pop. 13,462
- New London County, CT (Connecticut) - pop. 259,088
- New Madrid County, MO (Missouri) - pop. 19,760
- New York County, NY (New York) - pop. 1,537,195
- Newaygo County, MI (Michigan) - pop. 47,874
- Newberry County, SC (South Carolina) - pop. 36,108
- Newport County, RI (Rhode Island) - pop. 85,433
- Newport News city, VA (Virginia) - pop. 180,150
- Newton County, AR (Arkansas) - pop. 8,608
- Newton County, GA (Georgia) - pop. 62,001
- Newton County, IN (Indiana) - pop. 14,566
- Newton County, MO (Missouri) - pop. 52,636
- Newton County, MS (Mississippi) - pop. 21,838
- Newton County, TX (Texas) - pop. 15,072
- Nez Perce County, ID (Idaho) - pop. 37,410
- Niagara County, NY (New York) - pop. 219,846
- Nicholas County, KY (Kentucky) - pop. 6,813
- Nicholas County, WV (West Virginia) - pop. 26,562
- Nicollet County, MN (Minnesota) - pop. 29,771
- Niobrara County, WY (Wyoming) - pop. 2,407
- Noble County, IN (Indiana) - pop. 46,275
- Noble County, OH (Ohio) - pop. 14,058
- Noble County, OK (Oklahoma) - pop. 11,411
- Nobles County, MN (Minnesota) - pop. 20,832
- Nodaway County, MO (Missouri) - pop. 21,912
- Nolan County, TX (Texas) - pop. 15,802
- Nome Census Area, AK (Alaska) - pop. 9,196
- Norfolk County, MA (Massachusetts) - pop. 650,308
- Norfolk city, VA (Virginia) - pop. 234,403
- Norman County, MN (Minnesota) - pop. 7,442
- North Slope Borough, AK (Alaska) - pop. 7,385
- Northampton County, NC (North Carolina) - pop. 22,086
- Northampton County, PA (Pennsylvania) - pop. 267,066
- Northampton County, VA (Virginia) - pop. 13,093
- Northumberland County, PA (Pennsylvania) - pop. 94,556
- Northumberland County, VA (Virginia) - pop. 12,259
- Northwest Arctic Borough, AK (Alaska) - pop. 7,208
- Norton County, KS (Kansas) - pop. 5,953
- Norton city, VA (Virginia) - pop. 3,904
- Nottoway County, VA (Virginia) - pop. 15,725
- Nowata County, OK (Oklahoma) - pop. 10,569
- Noxubee County, MS (Mississippi) - pop. 12,548
- Nuckolls County, NE (Nebraska) - pop. 5,057
- Nueces County, TX (Texas) - pop. 313,645
- Nye County, NV (Nevada) - pop. 32,485
- O'Brien County, IA (Iowa) - pop. 15,102
- Oakland County, MI (Michigan) - pop. 1,194,156
- Obion County, TN (Tennessee) - pop. 32,450
- Ocean County, NJ (New Jersey) - pop. 510,916
- Oceana County, MI (Michigan) - pop. 26,873
- Ochiltree County, TX (Texas) - pop. 9,006
- Oconee County, GA (Georgia) - pop. 26,225
- Oconee County, SC (South Carolina) - pop. 66,215
- Oconto County, WI (Wisconsin) - pop. 35,634
- Ogemaw County, MI (Michigan) - pop. 21,645
- Ogle County, IL (Illinois) - pop. 51,032
- Oglethorpe County, GA (Georgia) - pop. 12,635
- Ohio County, IN (Indiana) - pop. 5,623
- Ohio County, KY (Kentucky) - pop. 22,916
- Ohio County, WV (West Virginia) - pop. 47,427
- Okaloosa County, FL (Florida) - pop. 170,498
- Okanogan County, WA (Washington) - pop. 39,564
- Okeechobee County, FL (Florida) - pop. 35,910
- Okfuskee County, OK (Oklahoma) - pop. 11,814
- Oklahoma County, OK (Oklahoma) - pop. 660,448
- Okmulgee County, OK (Oklahoma) - pop. 39,685
- Oktibbeha County, MS (Mississippi) - pop. 42,902
- Oldham County, KY (Kentucky) - pop. 46,178
- Oldham County, TX (Texas) - pop. 2,185
- Oliver County, ND (North Dakota) - pop. 2,065
- Olmsted County, MN (Minnesota) - pop. 124,277
- Oneida County, ID (Idaho) - pop. 4,125
- Oneida County, NY (New York) - pop. 235,469
- Oneida County, WI (Wisconsin) - pop. 36,776
- Onondaga County, NY (New York) - pop. 458,336
- Onslow County, NC (North Carolina) - pop. 150,355
- Ontario County, NY (New York) - pop. 100,224
- Ontonagon County, MI (Michigan) - pop. 7,818
- Orange County, CA (California) - pop. 2,846,289
- Orange County, FL (Florida) - pop. 896,344
- Orange County, IN (Indiana) - pop. 19,306
- Orange County, NC (North Carolina) - pop. 118,227
- Orange County, NY (New York) - pop. 341,367
- Orange County, TX (Texas) - pop. 84,966
- Orange County, VA (Virginia) - pop. 25,881
- Orange County, VT (Vermont) - pop. 28,226
- Orangeburg County, SC (South Carolina) - pop. 91,582
- Oregon County, MO (Missouri) - pop. 10,344
- Orleans County, NY (New York) - pop. 44,171
- Orleans County, VT (Vermont) - pop. 26,277
- Orleans Parish, LA (Louisiana) - pop. 484,674
- Osage County, KS (Kansas) - pop. 16,712
- Osage County, MO (Missouri) - pop. 13,062
- Osage County, OK (Oklahoma) - pop. 44,437
- Osborne County, KS (Kansas) - pop. 4,452
- Osceola County, FL (Florida) - pop. 172,493
- Osceola County, IA (Iowa) - pop. 7,003
- Osceola County, MI (Michigan) - pop. 23,197
- Oscoda County, MI (Michigan) - pop. 9,418
- Oswego County, NY (New York) - pop. 122,377
- Otero County, CO (Colorado) - pop. 20,311
- Otero County, NM (New Mexico) - pop. 62,298
- Otoe County, NE (Nebraska) - pop. 15,396
- Otsego County, MI (Michigan) - pop. 23,301
- Otsego County, NY (New York) - pop. 61,676
- Ottawa County, KS (Kansas) - pop. 6,163
- Ottawa County, MI (Michigan) - pop. 238,314
- Ottawa County, OH (Ohio) - pop. 40,985
- Ottawa County, OK (Oklahoma) - pop. 33,194
- Otter Tail County, MN (Minnesota) - pop. 57,159
- Ouachita County, AR (Arkansas) - pop. 28,790
- Ouachita Parish, LA (Louisiana) - pop. 147,250
- Ouray County, CO (Colorado) - pop. 3,742
- Outagamie County, WI (Wisconsin) - pop. 160,971
- Overton County, TN (Tennessee) - pop. 20,118
- Owen County, IN (Indiana) - pop. 21,786
- Owen County, KY (Kentucky) - pop. 10,547
- Owsley County, KY (Kentucky) - pop. 4,858
- Owyhee County, ID (Idaho) - pop. 10,644
- Oxford County, ME (Maine) - pop. 54,755
- Ozark County, MO (Missouri) - pop. 9,542
- Ozaukee County, WI (Wisconsin) - pop. 82,317
- Pacific County, WA (Washington) - pop. 20,984
- Page County, IA (Iowa) - pop. 16,976
- Page County, VA (Virginia) - pop. 23,177
- Palm Beach County, FL (Florida) - pop. 1,131,184
- Palo Alto County, IA (Iowa) - pop. 10,147
- Palo Pinto County, TX (Texas) - pop. 27,026
- Pamlico County, NC (North Carolina) - pop. 12,934
- Panola County, MS (Mississippi) - pop. 34,274
- Panola County, TX (Texas) - pop. 22,756
- Park County, CO (Colorado) - pop. 14,523
- Park County, MT (Montana) - pop. 15,694
- Park County, WY (Wyoming) - pop. 25,786
- Parke County, IN (Indiana) - pop. 17,241
- Parker County, TX (Texas) - pop. 88,495
- Parmer County, TX (Texas) - pop. 10,016
- Pasco County, FL (Florida) - pop. 344,765
- Pasquotank County, NC (North Carolina) - pop. 34,897
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