Blog · October 14, 2026 · Delaware
Sussex County Flood Zone Map in Delaware
FEMA's free flood maps and the Sussex County parcel viewer, used together for property near Georgetown.
Main page: Sussex County, DE GIS & Parcel Viewer (official map link, Sussex County facts and neighboring maps).
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Land along Cedar Creek Hundred and the flats outside Seaford are where a Sussex County flood zone map lookup matters most. FEMA's free Flood Map Service Center and the Sussex County parcel viewer answer it together.
We'll cover finding a Sussex County address on FEMA's map, what Zone A, AE and X mean, how the county viewer fits in, and what to do if the map looks wrong.
How to check the Sussex County flood zone map
The authoritative source for a Sussex County flood zone map is FEMA, so begin at the FEMA Flood Map Service Center. If a property near Bethel has no street number yet, search the nearest road and pan to it. On acreage outside Milford, FEMA's National Flood Hazard Layer viewer draws the zones over aerial imagery; zoom to the property near Bethel and click. Next, the Delaware FirstMap State Parcels confirms which Sussex County parcel you're looking at. If the Sussex County viewer has a floodplain layer, treat it as a convenience copy and confirm on FEMA's map.
Opening the Sussex County parcel viewer
Sussex County parcels are viewed through a statewide map, the Delaware FirstMap State Parcels; zoom toward Milford to reach them. Click any Sussex County parcel near Milford to open its record: owner, parcel ID and assessed acreage are most often listed. For a backup route to the map covering Bethel, our Sussex County directory entry keeps the link current.
What the flood zone letters mean
Any Sussex County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, land with a 1-percent chance of flooding in any given year (the base or 100-year flood). A surveyor working near Milford uses the base flood elevation printed for AE zones; unnumbered A zones don't have one. Land near Bethel in shaded X (Zone B on older maps) is moderate risk, between the 1-percent and 0.2-percent annual chance lines. Unshaded X (or C) on the Sussex County panel means minimal risk.
Neighboring maps around Sussex County
A farm near the county line can carry separate records in Kent County, Caroline County, MD, and Dorchester County, MD as well. Our Delaware page links each map neighboring Sussex County.
Waterfront parcels near Bethel
The Sussex County landscape includes Cedar Creek Hundred, Broad Creek Hundred and Little Creek Hundred, and that's where flood questions cluster. Lines on those Sussex County parcels often follow the water, so part of the tract can be mapped as high risk. A creek near Bethel that displays no detailed zone, so treat an unmapped channel as a reason to ask questions, not proof the ground stays dry.
What a flood zone means for a Sussex County buyer
The zone displays up again when a loan on a house near Bethel is underwritten. Where a building in Milford is mapped in a high-risk zone and secures a loan from a federally regulated or insured lender, the lender must require flood coverage, provided the community near Milford takes part in the National Flood Insurance Program. Outside the A zones around Bethel, insurance is a choice, not a mandate; pricing a policy for land near Bethel is still worth a call. If a building near Bethel sits above the flood line, the titleholder can ask FEMA for a Letter of Map Amendment (LOMA), most often backed by an elevation certificate from a surveyor who works in the county. Building or filling inside a mapped zone near Milford most often needs a floodplain permit; the county floodplain administrator can say what applies.
Quick answers for Sussex County
What if FEMA's map is wrong about my house near Milford?
An owner near Milford can request a Letter of Map Amendment from FEMA with elevation data, most often from a licensed land surveyor.
How do I know if a property in Sussex County is in a flood zone?
FEMA's free map service covers Sussex County: enter the address or pan to the property near Milford, then note the zone label.
What does 100-year flood mean for Sussex County land?
No, ground around Bethel mapped that way has a 1-percent chance of flooding every year, and two floods in one decade near Bethel are possible.
Can I build in a flood zone in Sussex County?
Often, but local floodplain rules apply; ask the county or town building office in Bethel before you buy.
What does Zone AE mean on a Sussex County flood map?
For a Sussex County parcel, Zone AE means a Special Flood Hazard Area with a 1-percent annual chance of flooding and a published base flood elevation.
Is there a floodplain layer in the Delaware FirstMap State Parcels?
Check the layer list in the Delaware FirstMap State Parcels; if Sussex County includes a floodplain layer, confirm the zone on FEMA's map anyway.
Open the official Sussex County, DE parcel map Sussex 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.