County ZIP codes · North Carolina · FIPS 37133
Onslow County, NC ZIP Codes
Onslow County, North Carolina has 18 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 16 residential and 2 for PO boxes or a single organization. 13 of the residential ones lie mainly in Onslow County and 3 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $54,127 in 28518 (Beulaville) to $88,908 in 28460 (Sneads Ferry) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Onslow County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $63,561 and $84,016.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 16 residential ZIP codes in Onslow County
13 ZIP codes lie mainly in Onslow County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 28540 | Jacksonville | 49,141 | 445 | $66k | $224k | 100% |
| 28546 | Jacksonville | 47,256 | 455 | $64k | $226k | 100% |
| 28547 | Camp Lejeune | 21,346 | 296 | $68k | – | 100% |
| 28574 | Richlands | 20,990 | 169 | $67k | $217k | 92% |
| 28539 | Hubert | 18,351 | 238 | $67k | $230k | 100% |
| 28460 | Sneads Ferry | 13,532 | 485 | $89k | $344k | 100% |
| 28445 | Holly Ridge | 10,797 | 104 | $84k | $386k | 91% |
| 28543 | Tarawa Terrace | 6,069 | 1,326 | $51k | – | 100% |
| 28555 | Maysville | 5,914 | 42 | $69k | $171k | 51% |
| 28544 | Midway Park | 4,386 | 413 | $52k | $142k | 100% |
| 28542 | Camp Lejeune | 3,508 | 2,204 | $126k | – | 100% |
| 28454 | Maple Hill | 2,895 | 36 | $73k | $209k | 53% |
| 28582 | Stella | 1,658 | 121 | $89k | $355k | 57% |
Partly in Onslow County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
8 ZIP codes of Onslow County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Onslow | Elsewhere |
|---|---|---|
| 28574 | 92% | Duplin County 4%; Jones County 4% |
| 28584 | 28% | Carteret County 72% |
| 28445 | 91% | Pender County 9% |
| 28518 | 11% | Duplin County 89% |
| 28555 | 51% | Jones County 49% |
| 28454 | 53% | Pender County 47% |
| 28582 | 57% | Carteret County 43% |
| 28521 | 4% | Duplin County 96% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 28541 | Jacksonville |
| 28545 | McCutcheon Field |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Onslow County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Onslow County's ZIP codes use 2 prefixes: 284 and 285.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.