Blog · October 14, 2026 · North Carolina
Onslow County Flood Zone Map (North Carolina)
FEMA's free flood maps and the Onslow County parcel viewer, used together for property near Holly Ridge.
Main page: Onslow County, NC GIS & Parcel Viewer (official map link, Onslow County facts and neighboring maps).
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Is that lot in Jacksonville in a flood zone? The Onslow County flood zone map answer comes from FEMA, and it is free to look up. Here's how to read FEMA's map for an Onslow County, NC property and match it to the parcel record.
The sections below go from the FEMA search to the Onslow County parcel record, then cover insurance, permits and map changes near Holly Ridge.
How to use the Onslow County flood zone map
Start at the FEMA Flood Map Service Center and enter the property address in Jacksonville or anywhere else in the county. Download the FIRM panel FEMA lists as effective for that part of Onslow County. If the PDF panel for Onslow County is hard to read, the National Flood Hazard Layer viewer is easier to use; zoom to the tract close to North Topsail Beach and click. Next, the Onslow County parcel viewer confirms which Onslow County parcel you're looking at. Match the Onslow County lines and acreage to the FEMA view, since flood maps do not draw property lines in detail.
Finding the tract on the Onslow County map
For land around Swansboro, open the Onslow County parcel viewer; it is the map Onslow County itself publishes. Click any Onslow County parcel near North Topsail Beach to open its record: owner, parcel ID and assessed acreage are typically listed. Bookmark our Onslow County page too; it tracks the official North Carolina link if it moves and lists the maps around North Topsail Beach.
Recorded documents in Onslow County, North Carolina
For a tract close to Jacksonville, the recorded documents sit with the Register of Deeds; the parcel map is built from them for taxes. Onslow County, like every North Carolina county, has a Register of Deeds that keeps deeds, deeds of trust and subdivision plats. A deed book and page or instrument number on the county record is the fastest way to request the document for a lot in Jacksonville.
Reading the zones on an Onslow County flood map
Any Onslow County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, defined by a 1-percent annual chance of being flooded. A surveyor working near Jacksonville uses the base flood elevation printed for AE zones; unnumbered A zones do not have one. Shaded Zone X around Jacksonville sits in the moderate band between the 100-year and 500-year floods. Unshaded Zone X near North Topsail Beach is minimal risk.
Near the Onslow County line
Near the edge of the county, check the next map over: Carteret County, Duplin County, Jones County, and Pender County all border it. Our North Carolina page links each map neighboring Onslow County.
Creeks, rivers and low ground in Onslow County
In Onslow County, look closest at tracts along Stump Sound Area Outstanding Resource Water. Waterfront and bottomland parcels near Jacksonville commonly carry a zone along one edge, so check where the buildable part sits. A creek near North Topsail Beach that lists no detailed zone, which is why it is worth walking the ground after a heavy rain.
When the map affects a deal
Insurance is the practical stake for an Onslow County buyer. If a barn or house outside Jacksonville sits in a Special Flood Hazard Area and carries a federally backed mortgage, federal rules call for flood insurance, provided the community near Jacksonville takes part in the National Flood Insurance Program. Outside the A zones around North Topsail Beach, coverage is optional, although some lenders require it anyway. Where a structure near Jacksonville looks higher than the shading suggests, a Letter of Map Amendment request is the formal route; a surveyor near North Topsail Beach can supply the elevation data. Building or filling inside a mapped zone near Jacksonville has to meet local floodplain rules, so call the county or the town office in Jacksonville before work starts.
Towns and land across Onslow County
From Jacksonville, the seat of the county, the map spreads out to Holly Ridge, North Topsail Beach, Richlands, and Surf City. Unincorporated communities in the county, including Hubert, Verona, and Haws Run, show up as small groups of parcels along the roads. Roughly 762 square miles of land and about 213,676 residents (2023 estimate) make up Onslow County. Subdivision lots dominate the county map around Swansboro, and open tracts are scarce. Onslow County was organized in 1734, so deeds for older farms near North Topsail Beach can run back a long way.
Onslow County, NC: common questions
What does 100-year flood mean for Onslow County land?
No; land near Jacksonville in the 100-year floodplain has a 1-percent chance of flooding every year, so floods can come in back-to-back years.
My lot in Surf City lists Zone AE. What does that mean?
For an Onslow County parcel, Zone AE means a Special Flood Hazard Area with a 1-percent annual chance of flooding and a published base flood elevation.
What does BFE mean on the flood map for Surf City?
On the map covering Surf City, it is the projected water surface in the base flood, and a surveyor compares the building near Surf City to it.
Can a flood zone in Onslow County be changed?
An owner near Jacksonville can request a Letter of Map Amendment from FEMA with elevation data, typically from a professional surveyor.
Can I build in a flood zone in Onslow County?
Building in a Special Flood Hazard Area near Surf City typically needs a floodplain permit and may require elevating the structure, so check with the county floodplain administrator.
Open the official Onslow County, NC parcel map Onslow County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.