Free Census Tract Lookup by Address

1. 11

   Enter the address

   Type a full US street address on one line. It needs a street number and a street name, and an email address or a web link is refused.

2. 22

   We ask the Census Bureau's records

   The address is placed on the Census Bureau's own map, and the tract, county and state around it are read from the match.

3. 33

   Read the answer

   You see the matched address, the census tract ID and name, the county and the state, or a plain sentence saying the address was not matched.

Bulk address checks run the same lookup on a whole list with one CSV file.

The free tool checks one address at a time. With a 1Lookup account you upload a CSV file in the dashboard, pick the column that holds the addresses and download the same file back with the result columns filled in on every row. A spreadsheet drops the leading zeros of an ID it reads as a number, so open the ID columns as text. These rows are invented.

• 2 credits for each address that is matched, and nothing for an address that is not matched.
• Up to 2 million rows in one CSV file.
• Up to 200 API requests per 10 seconds for each API key, and each account can make up to 1,000 requests a minute in total across all its keys.

The Census Tract Lookup API returns the same areas as JSON from one request.

Send the address on one line, or as street, city, state and zip fields, to the endpoint with your API key. An address that is matched costs 2 credits, and one that is not matched or is mistyped costs 0. Whether it was matched is in classification.found, and the other matched addresses are in insights.census_tract_result.other_matches.

curl -X POST https://app.1lookup.io/api/v1/census-tract-lookup \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"address": "100 Example St, Sampletown, IL 62999"}'

import requests

response = requests.post(
    "https://app.1lookup.io/api/v1/census-tract-lookup",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"address": "100 Example St, Sampletown, IL 62999"},
)
data = response.json()["data"]
print(data["classification"]["found"])

const response = await fetch('https://app.1lookup.io/api/v1/census-tract-lookup', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ address: '100 Example St, Sampletown, IL 62999' })
})
const { data } = await response.json()
console.log(data.classification.found)

{
  "success": true,
  "data": {
    "classification": {
      "found": true,
      "matched_address": "100 EXAMPLE ST, SAMPLETOWN, IL, 62999",
      "tract_geoid": "17999990001",
      "tract_name": "Census Tract 9900.01",
      "county_name": "Sample County",
      "state_abbreviation": "IL",
      "congressional_district": "Congressional District 99",
      "metro_area": "Sampletown, IL Metro Area",
      "place": "Sampletown city",
      "school_district": "Sampletown Community Unit School District 99",
      "match_count": 1
    },
    "metadata": { "credits_used": 2, "cache_hit": false }
  }
}

To place every address on a list from your own software, see our Census Tract Lookup API.

• The tract ID comes back as text with its zeros kept.

  A tract ID in the Census Bureau's tables can start with a zero, and a number would drop it. The ID here is text, so it matches the Census Bureau's own tables exactly.

• The county and state come with the tract.

  You see the county and the state beside the tract, so a tract number that repeats in two counties is never mistaken for the wrong one.

• An address that several records match says so.

  The first match is shown and the page says how many matched, so a common street is not taken for one place without a check.

• An address the Census Bureau cannot locate gets a plain answer.

  A PO box, a new street or a misspelled suffix returns a clear sentence about what to check, not an empty page.

• 01

  Lenders and compliance teams placing an application

  Find the tract and county of an application address, then join the tract ID to the Census Bureau tables your analysts already use.

• 02

  Researchers and nonprofits mapping the people they serve

  Place a client's address in its tract, then join the ID to American Community Survey tables to study the area.

• 03

  Site-selection teams checking a location

  See the tract and county a store, a lead or a property address falls in before you sort a list by market.

• 04

  Anyone who was asked for a tract number

  Find the census tract ID a form, a grant application or a program asks for, from a street address.

• Census Tract Lookup APIPlace a whole list of addresses in their census tracts, districts and school districts, billed only when the address is matched.
• 1Lookup vs Census GeocoderThe Census Bureau's free geocoder with raw layer records, against one flat tract and district answer.
• 1Lookup vs GeocodioFree daily lookups with census data as paid appends, against one flat price per address matched.
• 1Lookup vs Google Geocoding APIA per-request geocoder whose documented components list no census tract, against the tract and districts for an address.
• 1Lookup vs Texas A&M GeoServices2,500 free credits a month and census codes from 1990 to 2020, against the current tract and districts for a price per address matched.

People who look up a census tract by address also search for these.

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