ZIP 97231 · Oregon
Neighborhood data for ZIP 97231 — Portland (OR, NW Hills), Oregon
This page indexes the twelve public-records dimensions zipradar covers for ZIP 97231 — water, flood, wildfire, crime, schools, radon, air, lead, tax, deeds, zoning and the sex-offender registry — and names the federal or county regulator behind each. Follow a dimension for what that source covers, what it leaves out, and how often the regulator publishes; see methodology for the full cadence and limitations.
Last verified 2026-09-07 · methodology
Water quality
Source: EPA SDWIS
Drinking-water violations, lead-copper results, and health alerts per community water system, sourced from EPA SDWIS and refreshed quarterly.
Water quality for Portland (OR, NW Hills) →
Flood zone
Source: FEMA NFHL
Official FIRM flood-zone classifications by address with base flood elevations, sourced from the FEMA National Flood Hazard Layer and refreshed quarterly.
Flood zone for Portland (OR, NW Hills) →
Wildfire risk
Source: USDA Forest Service
Community-level wildfire hazard potential on a five-step scale, sourced from USDA Forest Service Wildfire Risk to Communities and refreshed annually.
Wildfire risk for Portland (OR, NW Hills) →
Air quality
Source: EPA Air Quality System (AQS), annual county summary
2025 annual air-quality summary (median AQI, category, unhealthy-day counts) by county, from EPA's Air Quality System, per US ZIP code.
Air quality for Portland (OR, NW Hills) →
Crime
Source: FBI UCR
Reported crime per 100,000 residents, normalized across years and agencies, sourced from the FBI Crime Data Explorer.
Crime for Portland (OR, NW Hills) →
Schools
Source: NCES Common Core of Data
District boundary, enrollment, student-teacher ratio, and school demographics sourced from the NCES Common Core of Data.
Schools for Portland (OR, NW Hills) →
Radon
Source: EPA Radon Zones
County-level radon risk zone (1, 2, or 3) sourced from the EPA Map of Radon Zones, with state-level supplementary testing context.
Radon for Portland (OR, NW Hills) →
Lead pipes
Source: EPA LCRR + RTI National Lead Pipe Map
Lead service-line counts reported under the 2024 Lead and Copper Rule Revisions, sourced from EPA LCRR and RTI's national map.
Lead pipes for Portland (OR, NW Hills) →
Property tax
Source: County assessors
Millage rates and assessment methodology from county assessor offices, covering the top 50 US metros.
Property tax for Portland (OR, NW Hills) →
Deed activity
Source: County recorders
Recent deed-transfer counts aggregated to ZIP level, sourced from county recorder offices. Homeowner names are never cached or republished.
Deed activity for Portland (OR, NW Hills) →
Zoning
Source: Municipal planning departments
Residential, commercial, industrial, and mixed-use zoning classifications sourced from municipal planning departments.
Zoning for Portland (OR, NW Hills) →
Sex offender registry
Source: NSOPW (federal deep-link)
Deep-link to the Department of Justice's National Sex Offender Public Website (NSOPW). zipradar does NOT cache or republish registry records.
Sex offender registry for Portland (OR, NW Hills) →
Multnomah County, OR
ZIP 97231 is in Multnomah County. County-level data anchors property tax (assessor), deeds (recorder), and the EPA Map of Radon Zones.
Multnomah County dashboard →Why ZIP 97231?
Portland (OR, NW Hills), Oregon is one of the 370 zip codes zipradar covers today, and coverage keeps expanding toward the full 41,000+ US zip code set. Want your zip added sooner? Email us.
Frequently asked questions
What ZIP code is Portland (OR, NW Hills), OR?
Portland (OR, NW Hills), Oregon is in ZIP 97231 (Multnomah County). zipradar federates neighborhood data for this ZIP across 12 dimensions: water, flood, wildfire, crime, schools, radon, air, lead, property tax, deeds, zoning, and sex-offender registry — each sourced from the primary federal or county regulator.
What county is ZIP 97231 in?
ZIP 97231 (Portland (OR, NW Hills), OR) is located in Multnomah County, Oregon. The county-level data anchors property tax records (assessor), deeds (recorder), and EPA Map of Radon Zones for this ZIP.
Where does zipradar get data for ZIP 97231?
zipradar names the primary source for each dimension: EPA (water, radon, air), FEMA (flood), FBI (crime), NCES (schools), USFS (wildfire), and Multnomah County county records (property tax, deeds, zoning). Each dimension page links to that regulator's own data — see /methodology for what's covered per source and how current it is.
Is ZIP 97231 data current?
Last verified 2026-09-07. Refresh cadence varies by source: EPA SDWIS quarterly, FEMA NFHL on map updates, FBI Crime Data Explorer annually, NCES annually, county assessor records typically annually. See /methodology for per-source cadence and known lag windows.
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