Search
united-states-flagUnited States
1-800-MELISSA
United States

Melissa Data Quality Platforms

Melissa's Full Spectrum DQ Approach. Learn More
mas-logo-web

Melissa Alert Service

Keep your contacts clean in the cloud with change alerts.

Unison

Validate, Cleanse & Maintain Data Quality Without Programming.
govcloud-address-suite-logo

GovCloud Address Suite

Verify global addresses & access change-of-address records for the U.S.

ETL/MDM PlatformsMelissa offers a host of solutions for full spectrum data quality to ensure the success of your data.

Our Data

Verify & enrich your records with multi-sourced, authoritative reference datasets.

Why Melissa?

Multi-sourced global datasets, persistent address key technology, 37+ yrs experience.
Global Address Database

Complete your master address file for improved mapping/visualization.
U.S. Geographic Data

Add lat/long coordinates to the ZIP+4 level.
Parcel Boundary Shapefiles

Find parcel boundaries & attribute data for 155 million properties.
ZIP Code Data

Verify 5-digit ZIP Codes and append census demographics.
U.S. Phone Data

Access all area codes & prefixes for the U.S. & Canada.
Canadian Geographic Data

Append postal codes, area codes, time zones & lat/longs.
U.S. Property Data

Enrich records with 400 fields of property & mortgage data.
U.S. Consumer Data

Access demographic, financial & lifestyle data.
U.S. Business Data

Add industry, revenue, location, sales volume & more.
ZIPList5 Medical MSA

Access ZIP Code that meet requirements for Health Care Financing Administration(HCFA)
ZIPList5 Max

Get every active ZIP Code currently defined by the USP Service.
County-ZIP Code Database

Access all ZIP Code to which the(USPS) delivers mail.

What We Do

Developer Tools for Legislative District and Elected Official Information

Whether you want to provide an elected official lookup tool on your website, or you’re building a new civic application, use the Cicero API for flexible and highly accurate address to district matching and legislator data population. We offer government official and legislative district data on a national, regional and local level for the U.S., Canada, Australia, the U.K. and more.

  • Flexible: Utilize multiple resources that return a wealth of legislative district and elected official information, easily integrated into your programs and applications.
  • Scalable: Our pricing scales as you do!
  • Reliable: With the most accurate data available and a high uptime on our servers, you can feel safe developing on the Cicero API.

Want to Know More? Contact our data specialists at 1-800-635-4772 Opt. 2

cicero-api-hero-graphic

Melissa G2 Awards

Always recognized and praised

Resources for All Types of Development

Match a location to legislative districts and extensive elected official contact information, or return a configurable boundary map. Our API returns many different queries such as location, officials, maps, election events and more in XML or JSON format.

Request Demo Now
cicero-resources-all

Build Specific Tools for Your Business

Organizations from small nonprofits to large enterprises have built tools and applications on the Cicero API. It can meet many development needs like creating constituent records, displaying district boundaries on a map, or showing elected official profiles in an app, among many others.

Request Demo Now
cicero-build

Try It Now

Try Melissa's Cicero API Now

Need Help?

Frequently Asked Questions

Are there any limits when using the API?

We ask that you limit API calls to 200 per minute. For more information about user obligations and rights, please see our Terms of Use.

What resources will I need to integrate the API?

You will need a software developer, or someone who has experience working with a REST API. To see our documentation on how to implement, please visit our documentation.

How do I get support for the Cicero API?

Please visit Melissa’s Product Support Center for documentation, technical support and other resources.

What does the term 'API Call' refer to?

A call is a line of communication used to ask an API to return a specific result. In the case of Cicero, you might make a call to the legislative_district resource, which will return a response of legislative districts to the location you specified.

Ready to Start Your Demo?

Start today with Melissa's wide range of Data Quality Solutions, Tools, and Support.

Schedule Demo Today!

© Copyright 2025 by Melissa Data Corporation. All Rights Reserved.
Do Not Sell or Share My Personal Information
Limit the Use of My Sensitive Personal Information

melissa-soc2-logo usps-cass hipaa-logo g2-grid-leader-small-business-spring-2025 g2-easiest-admin-small-business-spring-2025 g2-best-est-roi-small-business-spring-2025