Voter file loaded June 3, 2026 · figures are from that file, held as a fixed record
Onslow County, North Carolina has 108,569 active registered voters — 39.8% Republican, 16.0% Democratic, and 43.2% with no party affiliation, as of July 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | NM13 | 1,085 | 601 | 55.39% |
| 2 | SW19 | 5,106 | 2,593 | 50.78% |
| 3 | WN04 | 4,572 | 2,242 | 49.04% |
| 4 | ML23 | 1,185 | 544 | 45.91% |
| 5 | MT24 | 2,430 | 1,030 | 42.39% |
| 6 | TL06 | 3,668 | 1,514 | 41.28% |
| 7 | RL09 | 6,199 | 2,543 | 41.02% |
| 8 | HM05 | 4,540 | 1,838 | 40.48% |
| 9 | SF18 | 6,350 | 2,492 | 39.24% |
| 10 | FS16 | 5,403 | 2,115 | 39.14% |
Supervoters are active registered voters who cast a ballot in at least 3 of the last 4 November general elections (2018–2024). Percentages are precinct totals from the official state voter file — no individual voter information is shown. Precincts with fewer than 400 active voters are excluded.
How Onslow County voted for president
Election results are public records.
Onslow County at a glance.
Onslow County had an estimated 212,954 residents in July 2024, the 13th most populous of North Carolina's 100 counties, up 4.1% since the 2020 census. Of those, 159,781 are 18 or older, the voting-age population, and 10.9% are 65 or older. Its 108,569 active registered voters equal about 67.9% of that voting-age population.
It covers 762 square miles of land (279 people per square mile), and 60.2% of residents live outside any incorporated city or town. The largest cities and towns are Jacksonville (70,840), Holly Ridge (5,766), Swansboro (4,165), Richlands (2,446) and North Topsail Beach (1,081). The American Community Survey (2020-2024) puts it at a median age of 27.7, a median household income of $68,148, 26.0% of adults 25 and older holding a bachelor's degree or higher and 63.7% of occupied homes owned by the people living in them.
In 2024, 81,476 votes were cast for president, about 51.0% of the voting-age population; the Democratic ticket took 31.5% and the Republican ticket 67.5%. The two-party margin moved from R+21.5 in 2008 to R+36.0 in 2024.
- Population (2024 estimate)
- 212,954
- Population (2020 census base)
- 204,588
- Voting-age population (18+)
- 159,781
- Active voters per 100 adults
- 67.9
- Residents 65 and older
- 10.9%
- People per square mile
- 279
- Living outside incorporated places
- 60.2%
- Land area
- 762 sq mi
- Median age
- 27.7
- Median household income
- $68,148
- Adults 25+ with a bachelor's degree
- 26.0%
- Owner-occupied homes
- 63.7%
Largest cities and towns
- Jacksonville 70,840
- Holly Ridge 5,766
- Swansboro 4,165
- Richlands 2,446
- North Topsail Beach 1,081
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 31.5% | 67.5% | R+36.0 | 81,476 |
| 2020 | 33.6% | 63.8% | R+30.2 | 72,235 |
| 2016 | 31.0% | 65.6% | R+34.6 | 55,364 |
| 2012 | 36.0% | 62.9% | R+26.9 | 50,353 |
| 2008 | 38.8% | 60.3% | R+21.5 | 50,203 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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