ZIP codes

ZIP codes in Onslow County, North Carolina

Onslow County has 16 ZIP codes. 8 lie entirely inside it and 8 are shared with neighboring counties, so part of their land and their people are elsewhere. About 209,958 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 16; 1 more just touches the border (under 1% of their land)
Entirely inside: 8; 99% or more of their land
Shared with other counties: 8; Most with Duplin County (3)
Most populated ZIP: 28540; 49,141 people · Jacksonville
Least populated ZIP: 28582; 1,658 people
Largest ZIP by land: 28555; 141 sq mi · Maysville

Map of the ZIP codes in Onslow County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Onslow County

16 ZIP codes in Onslow County, NC, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
28445	Surf City	10,797	91%	≈ 9,458
28454	—	2,895	53%	≈ 2,747
28460	North Topsail Beach	13,532	100%	13,532
28518	Beulaville	7,651	11%	≈ 1,461
28521	Chinquapin	1,593	3.6%	≈ 167
28539	Jacksonville	18,351	100%	18,351
28540	Jacksonville	49,141	100%	49,141
28542	Jacksonville	3,508	100%	3,508
28543	Jacksonville	6,069	100%	6,069
28544	Piney Green	4,386	100%	4,386
28546	Jacksonville	47,256	100%	47,256
28547	Jacksonville	21,346	100%	21,346
28555	Maysville	5,914	51%	≈ 4,045
28574	Richlands	20,990	92%	≈ 20,744
28582	—	1,658	57%	≈ 765
28584	Peletier	14,939	28%	≈ 6,928

They also touch the county with under 1% of their land, so they aren’t counted: 28572.

ZIP codes shared with other counties

These 8 ZIP codes have part of their land in another county. The first figure is the share of their land in Onslow County; then, where the rest lies.

28445 (Surf City): 91% here; 9.0% in Pender County.
28454: 53% here; 47% in Pender County.
28518 (Beulaville): 11% here; 89% in Duplin County.
28521 (Chinquapin): 3.6% here; 96% in Duplin County.
28555 (Maysville): 51% here; 49% in Jones County.
28574 (Richlands): 92% here; 4.0% in Duplin County and 3.8% in Jones County.
28582: 57% here; 43% in Carteret County.
28584 (Peletier): 28% here; 72% in Carteret County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Jacksonville (6), Beulaville (1), Chinquapin (1), Maysville (1), North Topsail Beach (1), and Peletier (1); 9 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 284 and 285.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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