Company lists · Data refreshed September 2026
Top 25 Catholic dioceses worldwide
RevenueBase identified 882 catholic dioceses worldwide as of September 2026 and tracks 35,511 professional contacts across them, including 9,400 with verified work emails. The United States is the largest market and Charleston the largest hub.
This list covers catholic dioceses worldwide, 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. Country and city lists for catholic dioceses follow the table.
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 worldwide
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 | 333 contacts → | ||||
Indirect evidence “Finde einen Beruf bei uns, der dich erfüllt.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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. | |||||
| 16 | 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. | |||||
| 17 | 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. | |||||
| 18 | 313 contacts → | ||||
Partial evidence “We, The Church in the Archdiocese of Newark, are Catholic Christians who recognize and acknowledge in the life and ministry of Jesus Christ, His death and resurrection, the…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 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. | |||||
| 20 | 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. | |||||
| 21 | 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. | |||||
| 22 | 272 contacts → | ||||
Indirect evidence “We are a publicly funded school Division with an elected Board of Trustees and governed by the Education Act.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 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. | |||||
| 24 | 238 contacts → | ||||
Indirect evidence “Within the Archdiocese of Toronto, you will find a family of faith that is alive and at work in our community.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 230 contacts → | ||||
Indirect evidence “Die Geschichte des Bistums Limburg beginnt mit dem Zusammenbruch der weltlichen und kirchlichen Machtstrukturen in Europa als Folge der Französischen Revolution.” 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 882 catholic dioceses worldwide
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Catholic dioceses worldwide at a glance
As of Sep 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
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.
- Coverage
- Every country. Country and city lists for catholic dioceses are linked below.
- What qualifies
- Companies worldwide 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.
- 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, 9,400 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.
Catholic dioceses by location
5 lists · largest firstEvery Catholic dioceses list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 worldwide?
RevenueBase identified 882 catholic dioceses worldwide 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 country has the most catholic dioceses?
The United States leads with 295 companies, followed by Germany (51) and the United Kingdom (51). Every catholic dioceses list by country and city is linked on this page.
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 9,400 verified decision-maker contacts tracked across these 882 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.