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Combined exposures · Flooding, evacuation & humid heat

Flood exposure and what it compounds with in Mississippi

Flood exposure rarely arrives alone. In some Mississippi ZIP codes it overlaps with a second exposure that changes what flooding means there — how many households have no car to leave in, or how many humid-heat days the area already carries. This page is scoped to Mississippi, because these overlaps are regional patterns.

MississippiData release 2026Mapped, survey & modeled inputs

Across parts of Mississippi, flood exposure shows up in the same ZIP codes as one of two other measurements. Here is exactly what each of the three measurements is, what kind of instrument produced it, and what reference level it does — and does not — have.

How we measure this →
Flood exposureFEMA flood mapMapped · not modeled

This is how much of a ZIP code's land sits inside the 1% annual-chance floodplain — the area FEMA maps as the Special Flood Hazard Area, often nicknamed the "100-year floodplain." Despite that nickname it does not mean one flood per century: the 1% chance applies every single year, so such floods can strike in back-to-back years. It is read off FEMA's published flood maps rather than modeled, and it describes land, not any particular home.

FEMA National Flood Hazard Layer — the Special Flood Hazard Area (1% annual chance). A federal flood-map designation of land; it is not a health limit, and no ZIP on this page is described as having crossed a safety line.

Households with no vehicleCensus survey estimateACS · ZCTA-native

This is the share of households in a ZIP code with no vehicle available, from the Census Bureau's American Community Survey. It counts households rather than people, it is an estimate drawn from a sample rather than a full census, and it says nothing about why a household has no car. Next to flood exposure it is a logistical fact and nothing more: an evacuation that assumes a car is harder without one.

US Census Bureau, American Community Survey — a survey estimate carrying sampling error. There is no federal reference level for this measure, and none is implied.

Humid-heat daysModeled heat stressOccupational reference — not federal

This is the average number of days a year when the daily-high wet-bulb globe temperature reaches 28 °C — a heat-stress measure that combines temperature, humidity, sun and wind. Humidity matters because it slows the body's main way of cooling itself, sweat evaporating from the skin, so the same air temperature is harder on the body when the air is humid. The count is modeled across a 2011–2020 climatology, not measured at your address.

Cornell wet-bulb globe temperature data. The 28 °C line comes from NIOSH/ACGIH occupational heat-stress guidance written for workplaces — it is not a federal environmental limit, and reaching it is not a regulatory exceedance.

What this is — and isn't. These are separate exposures recorded for the same place. This page does not claim one causes another, does not combine them into a single risk number, does not rank areas by how pronounced an overlap is, and does not connect any of them to a health outcome. It reports where two figures are elevated together, and nothing more.

Evacuation vulnerability in Mississippi

Flood exposureHouseholds with no vehicle

The Mississippi ZIP codes (ZCTAs) that rank among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle. The ranking is national; this list is Mississippi only. Two separate facts recorded for the same place — leaving ahead of water is a harder logistical problem without a car.

  • 39038in Belzoni

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38725in Benoit

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38737in Drew

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 39079in Goodman

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38701in Greenville

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38930in Greenwood

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38746in Gunnison

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38639in Jonestown

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38643in Lambert

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 39113in Mayersville

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38944in Minter City

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38765in Panther Burn

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38952in Schlater

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38957in Sumner

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 39169in Tchula

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38676in Tunica

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 38963in Tutwiler

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

  • 39194in Yazoo City

    This area ranks among the highest 10% of US ZIP codes for both flood exposure and the share of households without a vehicle.

Dual climate exposure in Mississippi

Humid-heat daysFlood exposure

The Mississippi ZIP codes (ZCTAs) that rank among the highest 10% of US ZIP codes for both humid-heat days and flood exposure. The ranking is national; this list is Mississippi only. Two separate climate exposures that land in the same places here.

  • 38721in Anguilla

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39630in Bude

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39272in Byram

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39054in Cary

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39701in Columbus

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39702in Columbus

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 38924in Cruger

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39540in D'Iberville

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39062in D'Lo

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39525in Diamondhead

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39047in Flowood

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39553in Gautier

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39078in Georgetown

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 38930in Greenwood

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39507in Gulfport

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39746in Hamilton

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39088in Holly Bluff

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39201in Jackson

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39211in Jackson

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39560in Long Beach

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39097in Louise

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39113in Mayersville

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39456in McLain

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39562in Moss Point

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39563in Moss Point

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39120in Natchez

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 38765in Panther Burn

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39567in Pascagoula

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39581in Pascagoula

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39572in Pearlington

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39218in Richland

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39159in Rolling Fork

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39162in Satartia

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 38954in Sidon

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39166in Silver City

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39169in Tchula

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39177in Valley Park

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39180in Vicksburg

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39183in Vicksburg

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39773in West Point

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39193in Whitfield

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

  • 39194in Yazoo City

    This area ranks among the highest 10% of US ZIP codes for both humid-heat days and flood exposure.

Coverage & how to read this

Three different kinds of measurement sit behind this page, and they are not interchangeable: flood exposure is read off FEMA's published flood maps, households without a vehicle is a Census survey estimate, and humid-heat days are modeled over a 2011–2020 climatology. None of them is a reading taken at your address. A ZIP reaches a list here by ranking among the highest 10% of US ZIP codes for each of that pair's two measurements; the ranking is national, and the lists themselves are Mississippi only. A ZIP with an unobservable measurement is shown as not measured, never as "not impacted" — and a ZIP that is measured and simply does not carry an overlap is not listed at all, so absence from a list here is never a claim that a place is fine. Only the flood leg carries a federal designation, and that designation describes land, not a line any ZIP on this page has crossed. Read the full combined-exposure methodology →

Each ZIP links to its full ZipVitals page. Mississippi only — the national list is on the explainer page.