Last official estimated population of Onslow County was 179,563 (year 2014)[1]. This was 0.056% of total US population and 1.8% of total North Carolina state population. Area of Onslow County is 905.9 mi² (=2346.3 km²), in this year population density was 198.21 p/mi². If population growth rate would be same as in period 2010-2014 (+0.25%/yr), Onslow County population in 2025 would be 184,582 [0].
Historical population of Onslow County for period 1790-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1790-1800] +0.43 %/yr
[1800-1810] +1.72 %/yr
[1810-1820] +0.51 %/yr
[1820-1830] +1.08 %/yr
[1830-1840] -0.37 %/yr
[1840-1850] +0.96 %/yr
[1850-1860] +0.67 %/yr
[1860-1870] -1.56 %/yr
[1870-1880] +2.65 %/yr
[1880-1890] +0.47 %/yr
[1890-1900] +1.49 %/yr
[1900-1910] +1.69 %/yr
[1910-1920] +0.4 %/yr
[1920-1930] +0.39 %/yr
[1930-1940] +1.61 %/yr
[1940-1950] +8.89 %/yr
[1950-1960] +7 %/yr
[1960-1970] +2.23 %/yr
[1970-1980] +0.9 %/yr
[1980-1990] +2.88 %/yr
[1990-2000] +0.04 %/yr
[2000-2005] +0.89 %/yr
[2005-2010] +2.49 %/yr
[2010-2014] +0.25 %/yr
Looking for settlements in Onslow County? Visit this page: Settlements in Onslow County, NC
Population of Onslow County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 9467 | 8994 | 18,461 |
| 5 to 9 | 6658 | 6452 | 13,110 |
| 10 to 14 | 5330 | 5049 | 10,379 |
| 15 to 19 | 7950 | 4796 | 12,746 |
| 20 to 24 | 23242 | 10065 | 33,307 |
| 25 to 29 | 11886 | 9323 | 21,209 |
| 30 to 34 | 7423 | 6760 | 14,183 |
| 35 to 39 | 5318 | 4872 | 10,190 |
| 40 to 44 | 4191 | 4335 | 8,526 |
| 45 to 49 | 3612 | 3931 | 7,543 |
| 50 to 54 | 3864 | 4405 | 8,269 |
| 55 to 59 | 3685 | 4041 | 7,726 |
| 60 to 64 | 2904 | 3253 | 6,157 |
| 65 to 69 | 2434 | 2838 | 5,272 |
| 70 to 74 | 1829 | 2188 | 4,017 |
| 75 to 79 | 1309 | 1696 | 3,005 |
| 80 to 84 | 813 | 1091 | 1,904 |
| 85+ | 549 | 1036 | 1,585 |
Onslow County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 89461 | 75450 | 164,911 |
| WAC | 83174 | 67476 | 150,650 |
| WA | 79614 | 64076 | 143,690 |
| NHWAC | 72005 | 59223 | 131,228 |
| NHWA | 69051 | 56378 | 125,429 |
| BAC | 17956 | 16087 | 34,043 |
| NHBAC | 16423 | 14768 | 31,191 |
| BA | 15773 | 13912 | 29,685 |
| NHBA | 14618 | 12973 | 27,591 |
| H | 13003 | 9675 | 22,678 |
| HWAC | 11169 | 8253 | 19,422 |
| HWA | 10563 | 7698 | 18,261 |
| TOM | 3987 | 3826 | 7,813 |
| AAC | 3181 | 3643 | 6,824 |
| NHTOM | 3307 | 3192 | 6,499 |
| NHAAC | 2779 | 3330 | 6,109 |
| AA | 1770 | 2302 | 4,072 |
| NHAA | 1558 | 2160 | 3,718 |
| IAC | 1992 | 1713 | 3,705 |
| HBAC | 1533 | 1319 | 2,852 |
| NHIAC | 1376 | 1230 | 2,606 |
| HBA | 1155 | 939 | 2,094 |
| IA | 995 | 755 | 1,750 |
| HTOM | 680 | 634 | 1,314 |
| NHIA | 656 | 531 | 1,187 |
| NAC | 602 | 506 | 1,108 |
| HIAC | 616 | 483 | 1,099 |
| NHNAC | 489 | 421 | 910 |
| HAAC | 402 | 313 | 715 |
| NA | 325 | 254 | 579 |
| HIA | 339 | 224 | 563 |
| NHNA | 271 | 216 | 487 |
| HAA | 212 | 142 | 354 |
| HNAC | 113 | 85 | 198 |
| HNA | 54 | 38 | 92 |
• New Hanover County population
45.6 mi, 
207°
• Wayne County
50 mi, 
324°
• Craven County
34 mi, 
43°
• Sampson County
51.9 mi, 
287°
• Lenoir County
33.8 mi, 
346°
• Duplin County
27.3 mi, 
295°
• Pender County
28.1 mi, 
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• Greene County
50.7 mi, 348°
• Pamlico County
54.2 mi, 
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• Jones County
20.3 mi, 
23°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
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