Company lists · Data refreshed September 2026
Top 25 Library systems based in the United States
RevenueBase identified 812 library systems headquartered in the United States as of September 2026 and tracks 29,378 professional contacts across them, including 10,746 with verified work emails. New York is the largest hub.
This list covers library systems headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest library systems based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,494 contacts → | ||||
Partial evidence “The New York Public Library is a free provider of education and information for the people of New York and beyond.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,087 contacts → | ||||
Strong evidence “Established in 1896, Brooklyn Public Library is the nation’s sixth largest public library system and currently has nearly active cardholders.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 812 contacts → | ||||
Strong evidence “Queens Public Library is one of the largest and busiest public library systems in the United States, dedicated to serving the most ethnically and culturally diverse area in the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 714 contacts → | ||||
Partial evidence “Since 1873, Chicago Public Library (CPL) has encouraged lifelong learning by welcoming all people and offering equal access to information, entertainment and knowledge through…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 682 contacts → | ||||
Indirect evidence “KCLS Strategic Focus: We create opportunities by connecting people – individuals at all stages of life, families, communities and organizations – with: • Information and services…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 671 contacts → | ||||
Partial evidence “The Los Angeles Public Library provides free and easy access to information, ideas, books and technology that enrich, educate and empower every individual in our city's diverse…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 599 contacts → | ||||
Partial evidence “Cincinnati & Hamilton County Public Library has been cultivating curiosity from the moment we first opened our doors in 1853.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 518 contacts → | ||||
Partial evidence “Cuyahoga County Public Library serves 47 communities with 27 branches.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 473 contacts → | ||||
Indirect evidence “One county.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 462 contacts → | ||||
Partial evidence “Charlotte Mecklenburg Library is one of America’s leading urban public libraries, serving one of the country’s great emerging metropolitan areas in North Carolina.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 422 contacts → | ||||
Partial evidence “For over 50 years, Bibliotheca has partnered with libraries to meet the needs of their communities worldwide.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 418 contacts → | ||||
Partial evidence “The Indianapolis Public Library is the community's place to access essential information resources, technology, programs and services; foster reading and learning and promote the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 376 contacts → | ||||
Strong evidence “Mid-Continent Public Library is the largest public library system in Missouri, serving nearly people in the greater Kansas City metropolitan area across Clay, Jackson, and Platte…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 359 contacts → | ||||
Partial evidence “Boston Public Library provides educational, cultural and civic enrichment, free to all, for the residents of Boston, Massachusetts and beyond, through its collections, services…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 327 contacts → | ||||
Indirect evidence “Advancing knowledge.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 324 contacts → | ||||
Indirect evidence “Enriching lives through experiences and opportunities to learn, grow and connect.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 316 contacts → | ||||
Partial evidence “Harris County Public Library (HCPL) provides information and resources to enrich lives and strengthen communities through innovative services within and beyond our walls.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 313 contacts → | ||||
Partial evidence “Sno-Isle Libraries serves residents across 2,260 square miles in Snohomish and Island county through 23 community libraries, online services, and Library on Wheels.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 312 contacts → | ||||
Strong evidence “Sacramento Public Library is the fourth largest library system in California with 28 locations serving 1.4M urban, suburban and rural residents.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 303 contacts → | ||||
Partial evidence “SirsiDynix is the world’s leading provider of library technology solutions, connecting over 300 million people with information and resources at more than academic, public…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 282 contacts → | ||||
Partial evidence “Awarded the National Medal in 2017 by the Institute of Museum and Library Services, Richland Library is a vibrant, contemporary organization that provides resources and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 271 contacts → | ||||
Partial evidence “Jefferson County Public Library servers more than residents from ten different locations: Arvada, Belmar, Columbine, Conifer, Edgewater, Evergreen, Golden, Lakewood, Standley Lake…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 262 contacts → | ||||
Indirect evidence “Our mission: Enriching the community through lifelong learning and discovery.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 240 contacts → | ||||
Indirect evidence “Our vision is an empowered community where all people reach their potential.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 233 contacts → | ||||
Strong evidence “The Miami-Dade Public Library System is located in one of the most dynamic and diverse geographic areas in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: library systems. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names library systems.
- Partial evidence
- Its own public description names part of library systems, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name library systems. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 812 library systems based in the United States
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Library systems based in the United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 812 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among library systems, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “library systems”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names library systems), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among library systems, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 10,746 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names library systems, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many library systems are there based in the United States?
RevenueBase identified 812 library systems headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
The NEW York Public Library, headquartered in New York, tops this list with the largest team on record.
Which city has the most library systems?
New York leads with 7 headquartered companies, followed by Durham (5) and Washington (5).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 10,746 verified decision-maker contacts tracked across these 812 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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