Mold Costs And Risk In Every US Neighborhood

32,840 ZIP code neighborhoods in 3,125 counties, each with the age of its homes, renter share, home values, FEMA water hazard ratings, a local cost estimate and the state's mold rules. Every figure comes from the Census, FEMA, BEA or BLS.

StateCountiesZIP CodesMedian Year BuiltBuilt Before 1980
Alabama67626198542%
Alaska30238198537%
Arizona15403199230%
Arkansas75600198740%
California581,745197657%
Colorado64515198741%
Connecticut8284196768%
Delaware363198643%
District of Columbia125195770%
Florida67984198835%
Georgia159721199132%
Hawaii589197951%
Idaho44277199040%
Illinois1021,387197064%
Indiana92786197656%
Iowa99966197162%
Kansas105695197557%
Kentucky120760198248%
Louisiana64520198247%
Maine16419197655%
Maryland24461197952%
Massachusetts14532196368%
Michigan83982197262%
Minnesota87873197853%
Mississippi82408198642%
Missouri1151,024197853%
Montana56367198050%
Nebraska93580197558%
Nevada17174199622%
New Hampshire10244197852%
New Jersey21592196964%
New Mexico33361198444%
New York621,763195875%
North Carolina100827199035%
North Dakota53383198149%
Ohio881,209197064%
Oklahoma77657198050%
Oregon36422198050%
Pennsylvania671,806196568%
Rhode Island581196172%
South Carolina46413199134%
South Dakota66370197951%
Tennessee95615198642%
Texas2541,915199034%
Utah29290199137%
Vermont14259197657%
Virginia115865198444%
Washington39588198444%
West Virginia55729197657%
Wisconsin72776197558%
Wyoming23171198050%

Housing from Census ACS 2019 to 2023, ZIP areas from the Census 2020 ZIP relationship files, hazards from FEMA National Risk Index, December 2025.

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