Company lists · Data refreshed September 2026
Top 25 Catholic dioceses based in the United States
RevenueBase identified 295 catholic dioceses headquartered in the United States as of September 2026 and tracks 20,374 professional contacts across them, including 5,606 with verified work emails. Charleston is the largest hub.
This list covers catholic dioceses 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 19, 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 catholic dioceses based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,536 contacts → | ||||
Partial evidence “The Archdiocese of Chicago, the third largest archdiocese of the Roman Catholic Church in the United States, serves more than 2.2 million Catholics in 221 parishes.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 945 contacts → | ||||
Partial evidence “We, the faithful of the Roman Catholic Church in Philadelphia in communion with our Holy Father, shepherd of the universal Church, and our Archbishop, shepherd of the Church in…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 863 contacts → | ||||
Indirect evidence “We are a large non-profit organization with a wide variety of people, cultures and ministries.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 636 contacts → | ||||
Partial evidence “As Catholics in the Archdiocese of St.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 503 contacts → | ||||
Partial evidence “The Archdiocese of Baltimore, established as a diocese in 1789, comprises the City of Baltimore and Allegany, Anne Arundel, Baltimore, Carroll, Frederick, Garrett, Harford, Howard…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 431 contacts → | ||||
Strong evidence “The mission of the Diocese of San Jose, the Catholic Community of Santa Clara County, is to be a local Church that will inspire the people of this Valley to live the values taught…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 384 contacts → | ||||
Partial evidence “Since 1974, the Diocese of Arlington has given glory to God through worship, evangelization, and charity in Northern Virginia.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 378 contacts → | ||||
Indirect evidence “The Archdiocese of Milwaukee was established on November 28, 1843 and was created an archbishopric on February 12, 1875.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 371 contacts → | ||||
Indirect evidence “We are a multicultural Church with active members from every continent of the world.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 342 contacts → | ||||
Partial evidence “The Diocese of San Bernardino works in partnership with 93 parishes in Riverside and San Bernardino counties of California to provide for the spiritual welfare of more than 1.6…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 340 contacts → | ||||
Partial evidence “The Diocese of Rochester extends from the southern shore of Lake Ontario, through New York's Finger Lakes region, and to the New York-Pennsylvania border.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 340 contacts → | ||||
Partial evidence “Roman Catholic Church administration for San Francisco, San Mateo and Marin counties in Northern California.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 339 contacts → | ||||
Partial evidence “With roots dating back to 1701, the Archdiocese of Detroit continues to form a Catholic community in southeast Michigan.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 329 contacts → | ||||
Partial evidence “The Archdiocese of Cincinnati is the Roman Catholic Church for 19 counties in western and southwestern Ohio.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 324 contacts → | ||||
Strong evidence “The Catholic Diocese of Orlando was established in 1968 and is comprised of 79 parishes and 12 missions, two basilicas, 37 schools, and hundreds of ministries.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 321 contacts → | ||||
Strong evidence “The Roman Catholic Diocese of Phoenix is committed to helping the faithful encounter the living Christ through conversion, communion and solidarity.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 310 contacts → | ||||
Partial evidence “The Archdiocese of Atlanta serves a vibrant, diverse and rapidly growing Catholic community.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 308 contacts → | ||||
Partial evidence “The Roman Catholic Archdiocese of Washington is home to more than Catholics.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 277 contacts → | ||||
Partial evidence “The Archdiocese of San Antonio houses employees who work for archdiocesan agencies, administrative services, clergy, and consecrated life, Catholic schools, pastoral offices, and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 239 contacts → | ||||
Strong evidence “The Roman Catholic Diocese of Cleveland serves the people of the 8 counties located in northeast Ohio.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 219 contacts → | ||||
Strong evidence “Roman Catholic Diocese of St.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 218 contacts → | ||||
Strong evidence “We are the people of God in the Roman Catholic Diocese of Columbus.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 214 contacts → | ||||
Strong evidence “The Diocese of Camden serves approximately Catholics in 62 parishes in Atlantic, Camden, Cape May, Cumberland, Gloucester and Salem Counties.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 204 contacts → | ||||
Strong evidence “With 1.3 million Catholics and 63 parishes and centers across Orange County, the Roman Catholic Diocese of Orange is among the largest and most diverse faith communities in the…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 186 contacts → | ||||
Strong evidence “The Roman Catholic Diocese of Covington, KY was created on July 29, 1853 by His Holiness Pope Pius IX.” Source: RevenueBase Database · checked Sep 19, 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: catholic dioceses. 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 catholic dioceses.
- Partial evidence
- Its own public description names part of catholic dioceses, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name catholic dioceses. 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 295 catholic dioceses based in the United States
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Catholic dioceses based in the United States at a glance
As of Sep 19, 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 295 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 catholic dioceses, 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 “catholic dioceses”. 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 catholic dioceses), 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 catholic dioceses, 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, 5,606 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 19, 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 catholic dioceses, 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 catholic dioceses are there based in the United States?
RevenueBase identified 295 catholic dioceses 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?
Archdiocese Of Chicago, headquartered in Chicago, tops this list with the largest team on record.
Which city has the most catholic dioceses?
Charleston leads with 5 headquartered companies, followed by Portland (5) and Kansas City (4).
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 5,606 verified decision-maker contacts tracked across these 295 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 19, 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.