List57 | B2B Lead Generation, Mailing Lists, Data Strategy

Celebrating 30 Years — 1997 to 2026

Smarter Data.
Stronger Connections.
Better Results.

For 30 years, we’ve helped marketers and businesses find the right people at the right time. Verified lists, real leads, and now a full HighLevel agency under one roof.

30
Years in Business
500M+
Records Available
57
List Categories
1000s
Clients Served

The Problem We Solve

Fill Your Funnel With People Who Actually Buy

What if the problem isn’t your offer, your messaging, or your sales team? What if you’re just talking to the wrong people?

For 30 years, we’ve helped marketers and entrepreneurs fix this exact problem — not by working harder, but by working smarter. Verified data. Enhanced lists. Motivated buyers who are ready to engage.

How much time and money have you spent chasing leads that were never going to convert? What would change if your funnel started with people who were genuinely interested from day one?

Get a Free Quote

Email Lists

Verified, deliverable email addresses across every vertical and demographic.

📞
Phone & Mobile Lists

Cell and landline numbers including DNC-compliant contacts for guaranteed connections.

📍
Postal & Direct Mail

NCOA-updated mailing addresses with PCOA enhancement for up to 20% better delivery.

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Data Enhancement

Append geographic, demographic, and psychographic data to make your lists work harder.

Data Enhancement & Hygiene

Your List Is Only as Good as the Data In It

01

Data Hygiene

Scrubbing and filtering bad data from your list is the single highest-ROI move most companies never make. We clean email, postal, and phone lists — removing undeliverables, deceased records, and contacts that will never convert.

Learn About Hygiene →

02

Data Enhancement

We append geographic, demographic, psychographic, and firmographic data to your existing list. The result is a richer, more targetable asset that converts at a higher rate without buying new records.

Learn About Enhancement →

03

NCOA & PCOA Updating

USPS NCOA only catches 80% of movers. Our PCOA service uses multiple data sets to increase delivery accuracy by up to 20%, tracks movers up to 30 years back, and flags deceased contacts before you waste postage.

Learn About PCOA →

04

Phone Appending

Too many undeliverable calls? We append cell and landline numbers — including DNC-compliant contacts — to your existing list. Spend $1 on appending, save $10 on wasted dials.

Learn About Phone Append →

05

Email Appending

Turn a postal list into a multi-channel campaign. We match your records against our verified email database and append deliverable addresses — so you can reach the same people by mail and by inbox.

Learn About Email Append →

06

Suppression & DNC Scrubbing

Before you dial or mail, run your list through our suppression service. We scrub against the National DNC Registry, internal opt-out lists, and known litigator databases — protecting your campaign and your company.

Learn About Suppression →

30
Years
in the
List Business

Russ Guillemot
Founder & CEO

Cori Guillemot
Partner

619-678-1000
info@list57.com

About List57

We’ve Been Doing This Since Before Google Existed

List57 started in 1997 when direct mail was king and the internet was still a novelty. We’ve watched the industry go through fax blasts, email marketing, social media, programmatic ads, and now AI-generated search. Through all of it, one thing hasn’t changed: the right data, delivered to the right marketer, still wins.

Over the past 30 years, we’ve worked with thousands of marketers and business owners who came to us with the same problem — they were spending money on campaigns that weren’t converting, and they didn’t know why. Usually the answer was the data. Bad lists, outdated records, wrong demographics. We fix that.

Today, List57 has expanded beyond data. We’re now a certified HighLevel partner, which means we can not only get you the right list — we can set up the entire follow-up system that turns that list into revenue. Same company, same people, 30 years of experience, and a lot more tools.

Our Full Story →

List57 HighLevel

What If Every Lead You Bought Actually Got Followed Up?

Most businesses buy a list, send one email, and wonder why it didn’t work. The problem isn’t the list. It’s what happens after. We now offer a fully managed HighLevel setup — your CRM, your follow-up sequences, your booking calendar, your review requests — all running automatically while you focus on the work.

  • Every missed call gets an instant text back — no lead left behind
  • Automated follow-up sequences that run for weeks without you lifting a finger
  • Review requests go out after every completed job
  • Online booking so clients can schedule themselves
  • A real CRM so you can see exactly where every lead stands
  • We build it, configure it, and manage it for you

See How It Works →

Fully Managed. Done For You.

We handle the entire setup — CRM, automations, email sequences, booking calendar, and ongoing management. Most businesses spend 10x this replacing just one of the tools HighLevel includes.

See What’s Included →
Get a Free Consultation

No contracts. No long-term commitment. Cancel anytime.

Ready to Find Your Next 1,000 Customers?

Tell us what you’re selling and who you’re trying to reach. We’ll put together a custom list recommendation at no charge.