US Autocomplete

Overview

US Autocomplete offers a suite of APIs focused on address validation, geocoding, and autocompletion for both domestic and international addresses. Established in 2007, the platform aims to assist businesses in maintaining accurate address data, which can be critical for operations such as e-commerce, customer relationship management (CRM), and logistics. The core offerings include the US Address Autocomplete API, US Address Validation API, US Geocoding API, International Address Autocomplete API, and International Address Validation API. These services integrate into various applications to improve data quality at the point of entry and beyond.

For e-commerce platforms, the address autocomplete functionality can reduce cart abandonment by speeding up the checkout process and minimizing typing errors. In CRM systems, the validation APIs help ensure that customer addresses are accurate, preventing issues with mailings, deliveries, and data analysis. Logistics companies can use the geocoding and validation services to optimize delivery routes and confirm serviceability. The APIs are designed to be RESTful, enabling straightforward integration into existing systems across different programming environments. US Autocomplete provides comprehensive documentation with code examples and an interactive demo for developers to test functionality before implementation.

The platform's focus on both US and international addresses caters to businesses with a global reach, providing consistent validation capabilities regardless of geographic location. This can be particularly beneficial for organizations managing global customer databases or shipping to multiple countries. The accuracy of address data directly impacts operational efficiency and customer satisfaction, making tools like those offered by US Autocomplete relevant for data integrity initiatives. For comparison, other providers like Smarty (formerly SmartyStreets) also offer address validation services, focusing on similar use cases in data quality management.

Key features

• US Address Autocomplete API: Provides real-time suggestions as a user types, completing full US addresses. This reduces keystrokes and helps prevent common data entry errors in forms.
• US Address Validation API: Verifies the accuracy and deliverability of US addresses, standardizing formats and identifying invalid or incomplete entries. This supports precise mailing and shipping operations.
• US Geocoding API: Converts US street addresses into precise latitude and longitude coordinates, enabling mapping, proximity searches, and spatial analysis for logistics and location-based services.
• International Address Autocomplete API: Offers predictive text suggestions for addresses in numerous countries worldwide, streamlining global data entry processes.
• International Address Validation API: Validates and standardizes addresses across a wide range of international postal systems, confirming deliverability for global operations and cross-border e-commerce.

Pricing

As of May 28, 2026, US Autocomplete offers usage-based pricing with a free tier and several paid plans.

Detailed pricing and custom quotes for higher volumes are available on the US Autocomplete pricing page.

Common integrations

• E-commerce platforms: Integrate into checkout forms for real-time address completion and validation, reducing errors and improving customer experience.
• CRM systems: Used to cleanse and validate contact addresses within CRM databases like Salesforce or HubSpot, ensuring data accuracy for marketing and service operations.
• Logistics and shipping software: Incorporate into shipping labels and delivery management systems to verify addresses before dispatch, minimizing failed deliveries.
• Lead generation forms: Apply to web forms to validate addresses as leads are captured, improving the quality of contact data for sales and marketing teams.
• Enterprise Resource Planning (ERP) systems: Integrate for master data management, ensuring consistent and accurate address information across an organization's various departments.

Alternatives

• Smarty (formerly SmartyStreets): Offers address validation, geocoding, and autocomplete services with a focus on US and international addresses.
• Loqate: Provides global address verification, geocoding, and data quality solutions for various business applications.
• Melissa: Specializes in global data quality, including address validation, geocoding, and data enrichment services.

Getting started

To begin using the US Autocomplete API, developers typically sign up for an API key, which authenticates requests to the service. The API is RESTful, communicating over HTTP with JSON payloads. Here is an example of how to implement a basic US address autocomplete request using JavaScript, fetching suggestions as a user types into an input field. This example demonstrates a common pattern for integrating predictive address entry.

async function getAddressSuggestions(input) {
  const apiKey = 'YOUR_API_KEY'; // Replace with your actual API key
  const query = input.value;

  if (query.length < 3) {
    // Only fetch suggestions after a minimum number of characters
    return;
  }

  try {
    const response = await fetch(`https://api.usautocomplete.com/v1/autocomplete?key=${apiKey}&q=${encodeURIComponent(query)}`);
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const data = await response.json();
    displaySuggestions(data.suggestions);
  } catch (error) {
    console.error('Error fetching address suggestions:', error);
  }
}

function displaySuggestions(suggestions) {
  const suggestionsList = document.getElementById('suggestions-list');
  suggestionsList.innerHTML = ''; // Clear previous suggestions

  if (suggestions && suggestions.length > 0) {
    suggestions.forEach(suggestion => {
      const listItem = document.createElement('li');
      listItem.textContent = suggestion.text;
      listItem.onclick = () => {
        document.getElementById('address-input').value = suggestion.text;
        suggestionsList.innerHTML = ''; // Clear suggestions after selection
      };
      suggestionsList.appendChild(listItem);
    });
  }
}

// Example HTML structure (not part of the JS code block itself):
// <input type="text" id="address-input" onkeyup="getAddressSuggestions(this)" placeholder="Start typing address...">
// <ul id="suggestions-list"></ul>

// More detailed integration steps, including setting up an API key and managing
// rate limits, are available in the US Autocomplete REST API reference.

This JavaScript snippet illustrates how to connect to the US Autocomplete API for real-time suggestions. Developers would integrate this logic into their web forms, listening for user input events and dynamically populating a list of suggested addresses. Additional parameters can be passed to refine suggestions, such as restricting results to a specific state or city. Beyond simple autocompletion, the validation APIs allow for post-entry verification, correcting formatting, and ensuring deliverability. For more complex scenarios, such as batch processing addresses or integrating with backend systems, the company provides additional guides and SDKs in multiple languages, including Python, PHP, Ruby, C#, and Java, to facilitate integration across diverse technology stacks. The documentation also covers error handling, rate limiting, and best practices for securing API keys.