The API Layer for Grassroots Advocacy1M+ data points

District Lookup
Legislator API

One API call. Every US representative. Rich profiles, contact methods, and staff directories. Built for advocacy platforms and AI agents.

Get Free API Key Read the Docs

100 free lookups/month. No credit card required.

Live Demo

Try it live

Turn any address into actionable representative data.

Try an example:

Type an address or click an example above

Data Coverage

Complete civic data in every response

Not just names and party affiliations. Our API returns deep, structured profiles with 40+ data fields per legislator—everything you need to build meaningful civic engagement tools, advocacy platforms, and constituent services.

Legislator Profiles

Comprehensive biographical data for every representative.

Full biography & career history
Education background
Years in office & term dates
Official photos & headshots
Party affiliation & chamber

Legislative Activity

Track what your representatives are actually doing in Congress.

Bills sponsored & cosponsored
Complete voting records
Committee assignments & roles
Policy focus areas
Legislative priorities

Contact Information

Every channel to reach your representatives, verified and current.

Direct contact form URLs
DC & district office addresses
Office phone numbers
Official website URLs
District office locations

Social Media Profiles

Connect with legislators across every major platform.

X (Twitter) handles
Facebook pages
Instagram accounts
YouTube channels
Official RSS feeds

District Demographics

Understand the communities your representatives serve.

Population statistics
District boundaries & codes
Key district issues
Economic indicators
District overview & context

Staff Directory

Know who handles what in every congressional office.

Chiefs of staff
Legislative directors
Communications directors
District office managers
Policy area specialists

Quick Start

One call. All the data.

Dead simple integration. Works with any stack.

curl

Python

Node.js

# Look up legislators by address
curl "https://api.legisletter.org/v1/lookup" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{"address": "350 5th Ave, New York, NY 10118"}'

200 OKResponse

{
  "federal": {
    "senators": [{ "name": "Chuck Schumer", ... }],
    "representative": { "name": "Jerry Nadler", ... }
  },
  "state": { /* State legislators */ },
  "local": { /* City council, mayor */ }
}

Python

Node.js

Ruby

PHP

Rust

Zapier

AI-Ready Infrastructure

Works with Claude, GPT, and more

Structured JSON responses designed for LLMs. Give your AI agents real-time access to legislator data.

MCP Server

Plug-and-play server for Claude. Real-time lookups.

Claude Desktop & Code
Runs locally, data stays yours
Zero-config setup

Function Calling

Pre-built tool schemas. Copy-paste into any LLM.

GPT, Claude, Gemini ready
JSON tool definitions
Copy-paste schemas

Structured Output

Strict schemas. Your AI never guesses formats.

TypeScript types
Zod validation schemas
Consistent every call

Claude

GPT-5

Gemini

Plans

Simple pricing

Start free. Scale when ready. No surprises.

Free

$0/mo

Federal only

535 Congress members

100 lookups/month
All 40+ data fields
Claude & GPT ready
No credit card

Start free

Pro

$20/mo

Federal + State

7,900+ legislators in all 50 states

2,000 lookups/month
All 40+ data fields
Claude & GPT ready
Email support

Get Pro

National

$200/mo

Federal + State + Local

Complete coverage incl. city councils

Unlimited lookups
All 40+ data fields
Claude & GPT ready
Priority support

Get National

Need more? Contact us for enterprise pricing.

Ready to build?

Get your API key in seconds. Start building civic tech that matters.

Get API Key

No credit card required. Start with 100 free lookups.

District LookupLegislator API