US ZIP codes to county, time zone and demographics

Who it's for

Anyone who has ZIP codes and needs the facts behind them, from a spreadsheet user to an AI agent.

Try it

Enter up to 10 ZIP codes. Ziplore returns the county, time zone and Census numbers for each.

Real sample output

Captured from a live call to this API (trimmed for length).

{
  "results": [
    {
      "query": "10001",
      "zip": "10001",
      "city": "New York",
      "state": "NY",
      "stateName": "New York",
      "county": "New York County",
      "countyFips": "36061",
      "stateFips": "36",
      "latitude": 40.7484,
      "longitude": -73.9967,
      "timezone": "America/New_York",
      "utcOffset": "-04:00",
      "observesDst": true,
      "zipKind": "area",
      "population": 30511,
      "populationDensity": 48895.8,
      "medianAge": 35.8,
      "medianHouseholdIncome": 129852,
      "perCapitaIncome": 120099,
      "medianHomeValue": 561100,
      "medianGrossRent": 3361,
      "housingUnits": 18356,
      "ownerOccupiedPct": 24.1,
      "landSqMi": 0.624,
      "waterSqMi": 0,
      "counties": [
        {
          "fips": "36061",
          "landShare": 1
        }
      ]
    },
    {
      "query": "90210",
      "zip": "90210",
      "city": "Beverly Hills",
      "state": "CA",
      "stateName": "California",
      "county": "Los Angeles County",
      "countyFips": "06037",
      "stateFips": "06",
      "latitude": 34.0901,
      "longitude": -118.4065,
      "timezone": "America/Los_Angeles",
      "utcOffset": "-07:00",
      "observesDst": true,
      "zipKind": "area",
      "population": 19004,
      "populationDensity": 1768.1,
      "medianAge": 51.9,
      "medianHouseholdIncome": 187801,
      "perCapitaIncome": 147098,
      "medianHomeValue": 2000000,
      "medianGrossRent": 3251,
      "housingUnits": 9531,
      "ownerOccupiedPct": 70.7,
      "landSqMi": 10.748,
      "waterSqMi": 0.054,
      "topCoded": [
        "medianHomeValue"
      ],
      "counties": [
        {
          "fips": "06037",
          "landShare": 1
        }
      ]
    }
  ],
  "count": 3,
  "notFound": [],
  "meta": {
    "sources": {
      "zipCodes": "GeoNames postal codes (2026-09-24)",
      "areas": "US Census 2024 Gazetteer (ZCTA)",
      "demographics": "American Community Survey 2020–2024 5-year estimates",
      "counties": "US Census 2020 ZCTA-to-county relationship file"
    },
    "attribution": "ZIP data: GeoNames (CC BY 4.0), US Census Bureau; time zones: timezone-boundary-builder (ODbL, © OpenStreetMap contributors).",
    "dataBuiltAt": "2026-09-26T00:23:52.950Z",
    "version": "1.0.0"
  }
}

Limits, plainly

Free and rate limited so it stays fast for everyone. Big lists: a Starter key ($19/month) lifts it to 120 calls a minute and 60,000 a month, up to 600,000 ZIPs at 10 per call.

• 20 calls per minute per IP address.
• Up to 10 ZIPs per lookup call.
• Radius up to 25 miles, up to 50 results per call.
• Free tier: 200 calls a day per IP, no key; paid API keys from $19/month (or $5 pay-as-you-go) lift it. The whole ZIP table lives in memory at the edge, so calls take milliseconds.

Get an API key

US ZIP code API from public-domain Census data: city, state, county FIPS, coordinates, time zone and ACS demographics, radius search, nearest ZIP and distance, answered in milliseconds at the edge.

14-day money-back promise: if it doesn't work as described, email us within 14 days and we fix it or refund you in full. Refund terms.

Pay with card, Apple Pay, Google Pay or Link through Stripe Checkout (sales tax/VAT handled by Stripe). Your key appears on the page you return to right after checkout: save it. Manage or cancel any time at ziplore.cybermaxtools.com/manage. Send it as x-api-key: YOUR_KEY (or Authorization: Bearer YOUR_KEY, which MCP clients support). Check usage at /key. Failed calls are not counted. ZIP code APIs: Zipcodebase $45/month for 60,000 requests, ZipCodeStack $34.99 for 70,000, API Ninjas $39 for 100,000 shared across its APIs (median about $0.50 per 1,000, checked 27 Sep 2026). Ziplore Starter is $19 for 60,000 calls (same quota as Zipcodebase for less than half the price), Pro $39 for 250,000, 200 free calls a day, or $5 pay-as-you-go for 12,000.

curl -s "https://ziplore.cybermaxtools.com/api/zip?..." -H "x-api-key: YOUR_KEY"

# MCP (Claude Desktop, Cursor, VS Code)
{ "mcpServers": { "ziplore": { "type": "http", "url": "https://ziplore.cybermaxtools.com/mcp",
  "headers": { "Authorization": "Bearer YOUR_KEY" } } } }

# Usage so far
curl -s https://ziplore.cybermaxtools.com/key -H "x-api-key: YOUR_KEY"

Use the API

JSON over HTTPS, CORS enabled, no key. GET for quick calls, POST a JSON body for lists. Spec: openapi.json · llms.txt

curl -s "https://ziplore.cybermaxtools.com/api/zip?zip=10001%2C+90210%2C+7102"

# lists: POST a JSON body
curl -s -X POST https://ziplore.cybermaxtools.com/api/zip \
  -H "content-type: application/json" \
  -d '{"zips":["10001","90210","7102"]}'

import requests

r = requests.post("https://ziplore.cybermaxtools.com/api/zip",
                  json={"zips":["10001","90210","7102"]}, timeout=30)
r.raise_for_status()
for row in r.json()["results"]:
    print(row)

Endpoints: /api/zip look up up to 10 us zip codes · /api/radius every zip within n miles of a zip or point · /api/city every zip of a city, largest first · /api/nearest nearest zip to a point (reverse geocode) · /api/distance distance between two zips

Add it to your AI agent (MCP)

A remote MCP server at https://ziplore.cybermaxtools.com/mcp (streamable HTTP, no auth). Read-only tools with JSON schemas, so agents know exactly what to send.

// Claude Desktop, Cursor, VS Code, any MCP client (remote, no key)
{
  "mcpServers": {
    "ziplore": { "type": "http", "url": "https://ziplore.cybermaxtools.com/mcp" }
  }
}

# Claude Code
claude mcp add --transport http ziplore https://ziplore.cybermaxtools.com/mcp

# Tools: zip_lookup, zips_in_radius, city_zips, nearest_zip, zip_distance
# e.g. zip_lookup({"zips":["10001","90210"]})

• zip_lookup
  City, state, county and FIPS, coordinates, time zone with UTC offset, and Census demographics (population, income, home value, rent) for up to 10 US ZIP codes. Accepts ZIP+4, addresses and ZIPs missing a leading zero.
• zips_in_radius
  Every US ZIP within N miles (max 25) of a ZIP or a lat/lon point, closest first, with distance in miles.
• city_zips
  All ZIP codes of a US city, largest population first.
• nearest_zip
  Reverse geocode a latitude/longitude to the nearest US ZIP code(s), with distance.
• zip_distance
  Great-circle distance in miles and km between two US ZIP codes.

FAQ