Address Validation API for the United States — 221M Records + Free Census Geography | Acuris

🇺🇸 UNITED STATES

Address validation API for the United States.

Validate and geocode US addresses to the house number against 221 million reference records — with coordinates and free census geography (county FIPS, census tract, CBSA, congressional district and school district) that other providers charge for or don't offer at all.

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✓ Built on 221 million house-number-level US address records.
221M
house-numbered addresses
50
states + DC, full coverage
Lat / Lng
point coordinates where available
Free
census geography
One call in · a complete record out

What a US validation returns

Send a messy address; get back a standardized, geocoded record — plus the census geography that analytics, government and insurance workflows actually need, at no extra cost.

You send
1600 pennsylvania ave nw
washington
↓ /validate
You get back
street1600 Pennsylvania Ave NW
city / stateWashington, DC
zip20500
lat / lng38.89770, -77.03655
county_fipsFREE11001
census_tractFREE11001006202
cbsaFREEWashington-Arlington
congressional_districtFREEDC-AL (119th)
school_districtFREEDistrict of Columbia PS
av_statusVerified

// illustrative example. Census geography is returned on street-accurate matches.

Coverage for the United States

Everything a US address workflow needs

Validation

Deliverable to the house number

221 million records carry a house number, so you validate and correct to the exact address, standardize street / city / state / ZIP, and flag what changed — across all 50 states and DC.

Geocoding

Coordinates for every match

Latitude/longitude returned for every validated address — point-coordinate precision where the data supports it, street-level interpolation elsewhere — for mapping, routing and territory analysis.

Enrichment · included

Free census geography

Every street-accurate match can return county & state FIPS, census tract, block group, CBSA (metro/micro), 119th-Congress congressional district and school district — sourced from the US Census Bureau. The enrichment enterprise vendors gate behind contracts.

Your data

Keep your results

Store and reuse validated US addresses for your own internal business use — no 30-day-delete rule, no "no repository" clause. See how that compares →

Reference · the US address format

How US addresses are structured

Number + street1600 Pennsylvania Ave NW — house number first, then street, with optional pre/post directionals (NW, S) and unit.
City, StateWashington, DC — city and the 2-letter USPS state code.
ZIP20500 — 5-digit ZIP, optionally ZIP+4 (20500-0003) for the finest USPS delivery segment.
FIPS & tractCensus identifiers — state + county FIPS, 11-digit census tract, block group — returned free for joins to Census, ACS and other public datasets.
Straight answers

US address validation, answered

How complete is the US coverage? +
221 million house-number-level records across all 50 states and DC. Every record carries a house number, so validation and correction resolve to the exact address, not the city or ZIP centroid.
What enrichment is included for free? +
US Census geography, at no extra cost. Every street-accurate US validation can return county & state FIPS, census tract, block group, CBSA (metro/micro), the 119th-Congress congressional district and the school district — ideal for demographics joins, catchment analysis, insurance rating and government reporting.
Do I get point coordinates? +
Coordinates for every match, point coordinates where the data supports it. Where a rooftop point exists it's returned; otherwise you get street-level interpolation. Both are yours to store and use for mapping and routing.
Can I store the validated US addresses? +
Yes, for your own internal business use. Unlike the big mapping APIs (30-day-delete or no-repository terms), Acuris lets you keep and reuse validated US results — you just can't resell or redistribute them as a dataset. See the storage-rights comparison →
🇺🇸 United States

Validate, geocode and enrich US addresses — free to start

House-number accuracy, coordinates and free census geography. Keep every result for internal use.

Get your free API key → Read the docs

Coverage figures reflect the Acuris US reference database (~221 million house-number-level records across all 50 states and DC). Census geography enrichment derives from US Census Bureau TIGER/Line and related public data (FIPS, census tract, block group, CBSA, 119th-Congress districts, school districts). Coordinate precision is point coordinates where the source data supports it and street-level interpolation otherwise. Example responses are illustrative. Validated results may be stored for internal business use and are not for resale or redistribution. Verified July 2026.