Blog · October 14, 2026 · Massachusetts
Suffolk County Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Interstate 90.
Main page: Suffolk County, MA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around US Route 1, pull up the Suffolk County flood zone map: the zone on that map shapes insurance, building rules and resale. Covered here for Suffolk County: locating a parcel on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
The Suffolk County flood zone map: start here
For parcel-by-parcel detail, use the National Flood Hazard Layer viewer, which lets you click a spot and read its zone, which applies near Interstate 93 as much as anywhere. Rural land near US Route 20 with no street number is still easy to locate: zoom in from US Route 20 and click inside the land.
Where the parcel data lives
Your first stop is the MassGIS Interactive Property Map; it covers each assessed parcel in the county, US Route 20 included. If you're looking near Interstate 93, put in a street address, an owner's name or a parcel number, and the matching parcel lights up. If the land is near US Route 20, a pop-up or side panel normally shows the owner of record, assessed acreage, a parcel ID and in many cases the last transfer.
What the zone letters mean
Zone AE comes with a base flood elevation, while plain Zone A does not; surveyors near Interstate 90 use that number. For acreage around US Route 20, minimal risk is not no risk: FEMA notes that floods happen outside mapped zones too.
Matching the zone to the lot lines
When the zone clips a corner of a lot near US Route 1, what matters is where the building sits.
Next door to Suffolk County
Suffolk County meets Essex County, Middlesex County, Norfolk County, and Plymouth County; every one of them runs a separate parcel map. A tract near the line by US Route 20 can show up in two county records, so open the neighboring map too. If you're looking near Interstate 90, the Platbookmapper state page lists every bordering county map across Massachusetts.
Low spots and local drainage
Small streams around Interstate 93 may not have detailed mapping, so walk the land after rain. Wetlands near US Route 20 can limit building even outside a flood zone; check the National Wetlands Inventory mapper for a first look.
Places you'll see on the map
Boston holds the county offices, where most land records are kept. Other places on the map include Chelsea, Revere, Winthrop, and Boston Harbor Islands National Recreation Area, each with its own cluster of lots. Around 768,425 people live in Suffolk County (Census Bureau estimate, 2023) on about 58 square miles. Suffolk County was formed in 1643, so old deeds can run back a long way. Places such as Boston Harbor Islands National Recreation Area help you orient on the aerial.
Insurance, lenders and building
For a home near Interstate 90, an Elevation Certificate from a surveyor helps: it can change the insurance price a lot. New construction in a floodplain near US Route 1 usually means extra permit review; call the permitting office before you plan.
Field tips
Most viewers work in a phone browser, useful out on a road near US Route 20, but coverage can be spotty out of town. A printout of the tract near Interstate 90 is a good backup.
Questions to ask before you buy
If the land is near Interstate 93, request for any Elevation Certificate before closing; an insurance quote early keeps the budget honest.
Sections, lots and bearings
Rural deeds near US Route 20 commonly use metes-and-bounds descriptions, a series of courses and distances from a starting point. Town lots near US Route 1 are typically described by lot and block, which is simpler to follow. Keep the legal description for land near US Route 1 when you talk to a surveyor.
A word on accuracy
Parcel lines are drawn for taxes, not measured on the ground, so a fence near Interstate 90 may sit several feet off the line on screen. For a tract near US Route 1, records update in batches, so a deed recorded last month can take weeks to appear.
Questions about the Suffolk County flood zone map
Can I see flood zones on the MassGIS Interactive Property Map for land near US Route 1?
Good question; the parcel map near US Route 1 might show FEMA zones, but FEMA's own map is the official source.
How can I tell if a house near US Route 1 is in a flood zone?
It depends, but look up the spot near Interstate 93 in FEMA's National Flood Hazard Layer viewer; no account is needed.
Where do I find the BFE for a lot near Interstate 93?
It depends, but a BFE near US Route 20 tells builders how high the lowest floor should be; surveyors near US Route 1 use it often.
How often are flood maps updated near Interstate 90?
It depends, but a new study can move a zone line near Interstate 93; your community is notified before changes take effect.
How do I save a parcel from the viewer near US Route 20?
Use the print button or a screenshot, and it's worth keeping the parcel ID visible for land near Interstate 93.
Open the official Suffolk County, MA parcel map See it 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.