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Data USA API

datausa.io · Government

Government No Auth Free & Open Demographics US Census Economics

US Census and economic data visualized — population, wages, education, employment, and housing for states, cities, counties, and industries. Free, no API key.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Get population data

Get current population for all US states.

https://datausa.io/api/data?year=latest&measures=Population&drilldowns=State

Hover any highlighted part to learn what it does

curl -X GET "https://datausa.io/api/data?year=latest&measures=Population&drilldowns=State"
import requests
params = {
    "year": "latest",
    "measures": "Population",
    "drilldowns": "State"
}
response = requests.get(
    "https://datausa.io/api/data",
    params=params,
)
print(response.json())
const url = new URL('https://datausa.io/api/data');
url.searchParams.set('year', 'latest');
url.searchParams.set('measures', 'Population');
url.searchParams.set('drilldowns', 'State');

const response = await fetch(url); 
const data = await response.json();
console.log(data);
package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://datausa.io/api/data")
	q := baseURL.Query()
	q.Set("year", "latest")
	q.Set("measures", "Population")
	q.Set("drilldowns", "State")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}
require "net/http"
require "json"

uri = URI("https://datausa.io/api/data")
uri.query = URI.encode_www_form({
  "year" => "latest",
  "measures" => "Population",
  "drilldowns" => "State"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)
<?php
$url = "https://datausa.io/api/data?" . http_build_query([
    "year" => "latest",
    "measures" => "Population",
    "drilldowns" => "State"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗
  1. No API key needed
  2. State populations: GET /api/data?drilldowns=State&measures=Population&year=latest
  3. City data: GET /api/data?drilldowns=Place&Geography=16000US0644000&measures=Average+Wage&year=latest (LA)
  4. Industry wages: GET /api/data?drilldowns=Industry+Group&measures=Average+Wage&year=latest
  5. More examples at datausa.io/about/api

What can you build with Data USA API?

Data USA API is a Government API. Developers commonly use government APIs for:

  • surfacing public datasets in citizen-facing apps
  • building transparency and civic engagement tools
  • accessing legislation, court records, and official data
  • powering research and journalism tools
  • creating compliance and regulatory monitoring dashboards

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Data USA API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗