{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/flood-zone/46204/","name":"Flood zone for ZIP 46204 — Indianapolis, IN","description":"Flood zone data for ZIP 46204 (Indianapolis, Indiana), sourced from FEMA NFHL.","topic":{"slug":"flood-zone","label":"Flood zone","source":"FEMA NFHL","sourceUrl":"https://www.fema.gov/flood-maps/national-flood-hazard-layer","refreshCadence":"Quarterly LOMA updates","summary":"Not on zipradar yet. The plan is the FEMA flood zone code, what it means in plain English, and the base flood elevation where assigned. Until then, look the address up on FEMA's Flood Map Service Center.","limitations":"For an official flood-zone determination (required by lenders), consult the FEMA Map Service Center directly. zipradar shows informational classifications only."},"place":{"zip":"46204","city":"Indianapolis","state":"IN","stateFull":"Indiana","county":"Marion County","countySlug":"marion-county","geo":{"latitude":39.7717,"longitude":-86.158}},"stateContext":{"topConcern":"Radon, lead pipes (older Rust Belt cities)","narrative":"Indiana has Zone 1 radon coverage across most counties. Lead-service-line inventories under LCRR are heaviest in Gary, South Bend, Hammond, Indianapolis. Tornado exposure peaks April-June."},"radonZone":null,"airQuality":null,"waterQuality":null,"datePublished":"2026-04-24","dateModified":"2026-09-24","canonicalUrl":"https://zipradar.org/topic/flood-zone/46204/","zipDashboardUrl":"https://zipradar.org/zip/46204/","zipDashboardApiUrl":"https://zipradar.org/api/zip/46204/","primarySourceUrl":"https://www.fema.gov/flood-maps/national-flood-hazard-layer","license":{"content":"CC-BY-4.0","attribution":"zipradar.org — https://zipradar.org/topic/flood-zone/46204/"}}