
Parish boundary maps are a valuable tool for those interested in genealogy, helping them to understand which Catholic churches existed in a particular neighbourhood or town and to locate the birth or marriage records of their ancestors. These maps are available for several places in the US, including Boston, Atlanta, and Orange County. They can be used to find the closest parish church to a given address and to determine the boundaries of dioceses and provinces.
| Characteristics | Values |
|---|---|
| Diocese boundaries | Based on county boundaries, which are based on U.S. Census shapefiles |
| Map colours | Parish churches are plotted in the same colour as the parish boundary shading |
| Map symbols | Globus cruciger symbols represent cathedral locations |
| Map features | Layer control feature allows users to toggle features such as diocese names and cathedral locations on and off |
| Map functions | Hovering over a county reveals its name, diocese(s), and province(s); hovering over a cathedral reveals its name |
| Map limitations | Jurisdiction over areas extending into water is unclear |
| Map sources | Diocese of Orange, Archdiocese of Boston, Arlington Diocese |
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What You'll Learn

Utilise online parish boundary maps
Utilising online parish boundary maps is a great way to visualise where your ancestors lived and which Catholic churches were operational during their time there.
The Roman Catholic Archdiocese of Boston Records, 1789-1920, on AmericanAncestors.org, provides a parish boundary map linked in the description section. This map offers two viewing options: Map Viewer and ArcGIS Desktop. The Map Viewer provides a graphic of Boston with multi-colours, and you can zoom in on individual towns using the (+) icon. Each section of the map is colour-coded based on the 1955 parish boundaries, and individual dots represent specific churches, plotted in the same colour as the parish boundary shading. If a church served a particular population, such as French Canadians, it is denoted by a black dot. Clicking on a dot displays a pop-up with the church's name and address. Additionally, you can type a specific address into the map viewer's search box to locate nearby churches.
Similarly, the Diocese of Orange provides a map of parishes assigned to residents of specific cities on its website.
For a broader perspective, an interactive map of US Catholic dioceses is available on Reddit, created using Python and geojson.io. This map distinguishes diocesan boundaries with white lines and provincial boundaries with black lines, while also indicating cathedral locations and diocese names. You can use the layer control feature to toggle between different layers, such as diocese names and cathedral locations. Hovering over a county or cathedral will reveal its name and corresponding diocese or province.
These online parish boundary maps serve as valuable tools for those interested in genealogy, providing insights into the historical locations of Catholic churches and the parishes they served.
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Contact the Diocese
If you are trying to find Catholic parish boundaries, one way to do so is by contacting the Diocese. The Diocese of Orange, for example, provides a map of parishes assigned to residents of certain cities on its website. For further information, the Diocese of Orange also provides a phone number for its Pastoral Centre, which can be called for more details.
Another example is the Archdiocese of Philadelphia, which provides an interactive map on its website. This map allows users to search for a specific address, and then zooms in to show the address location and the parish within which it falls. Contact details for the Archdiocese of Philadelphia are also provided, including phone numbers and email addresses for staff members.
In addition to these online resources, there are other websites that can help you find the contact information for specific dioceses, such as CatholicDirectory.org. This website provides a search function to find Catholic Bishops Conferences, as well as a list of dioceses, parishes, and other Catholic organisations.
Dioceses are groups of churches that are supervised by a bishop, and they are usually based on county borders. Most dioceses ruled by an archbishop are called archdioceses, and they are typically placed at the head of an ecclesiastical province. Some examples of archdioceses in the United States include Los Angeles, Orange County, and Arlington, VA.
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Identify cathedral locations
To identify cathedral locations within Catholic parish boundaries, there are several methods and tools available. Here are some steps you can take:
Understand Parish and Diocesan Boundaries
Firstly, it is important to understand the structure of the Catholic Church. In the Catholic Church, a parish is a community of the faithful within a particular church, overseen by a parish priest and under the authority of a diocesan bishop. Dioceses are groups of churches supervised by a bishop, and they are typically based on county borders. Most dioceses are divided into parishes with geographical boundaries.
Utilize Online Maps and Directories
Online maps and directories can be extremely helpful in identifying cathedral locations within Catholic parish boundaries:
- The Catholic Directory (catholicdirectory.org) provides a way to find Catholic parishes, dioceses, masses, schools, and priests near you.
- Masstimes.org and other map apps can help you find a list of Catholic churches near your location.
- Interactive maps, such as those provided by Reddit users for U.S. Catholic dioceses, allow you to visualize diocesan and provincial boundaries, as well as cathedral locations. These maps often include features like hovering over a cathedral to reveal its name.
- Official websites of specific dioceses, such as the Diocese of Orange, may provide maps or information about parishes and their boundaries.
Contact Diocesan or Parish Offices
If you are unable to find the information you need online, you can try contacting your diocesan or local parish offices. They may be able to provide you with information about parish boundaries and cathedral locations within those boundaries.
Search for Bishops' Conferences
You can also try searching for Catholic Bishops' Conferences (CBC) using online search tools. This can help you identify cathedral locations within specific dioceses or regions.
By combining these methods and utilizing the available resources, you should be able to effectively identify cathedral locations within Catholic parish boundaries.
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Research civil records
Civil records can be a useful tool for discovering Catholic parish boundaries. These records often contain valuable information such as maps, addresses, and dates that can help identify parish boundaries and the operational churches within them.
One example of this is the Roman Catholic Archdiocese of Boston Records, 1789-1920, which can be found on AmericanAncestors.org. This database includes a parish boundary map that allows users to visualize the boundaries and locations of Catholic churches in Boston. By utilizing the Map Viewer or ArcGIS Desktop, individuals can explore the map, zoom in on towns, and identify the specific churches within each parish boundary. Each dot on the map represents a church, and clicking on it provides the name and address of that church.
Similarly, the Diocese of Orange has developed Parish Boundaries that can be accessed on their website. By contacting the Pastoral Center, individuals can obtain information about the parishes and their boundaries. Utilizing these resources can provide a clearer understanding of the geographical extent of each parish and the communities they serve.
In addition to official websites, online communities such as Reddit can also provide valuable insights. Users on the r/Catholicism subreddit have shared interactive maps of US Catholic dioceses, with diocesan boundaries represented by white lines and provincial boundaries by black lines. These maps, created using Python and geojson.io, offer a visual representation of Catholic parish boundaries across the United States.
By leveraging civil records, mapping tools, and online resources, individuals can gain a deeper understanding of Catholic parish boundaries and the churches that fall within them. These tools facilitate the exploration of historical contexts, genealogical research, and the geographical distribution of Catholic parishes.
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Use mapping tools
Many Catholic organisations provide mapping tools to help you find parish boundaries. These tools are often interactive maps with additional information, such as the location of Catholic churches and their operational histories.
For example, the Archdiocese of Boston has a parish boundary map that can be used to visualise where your ancestors lived. The map provides a street-level view and shows the Catholic churches that were operational at the time your ancestors lived there. The map is colour-coded, with each section representing the 1955 parish boundaries. Individual churches are plotted with dots, with black dots representing churches that served a specific population. When you click on a dot, a popup box displays the name and address of the church.
The Roman Catholic Archdiocese of Atlanta also provides an interactive "Parishes by Boundaries Map" on its website. Similarly, the Diocese of Orange provides an interactive map of parishes and their boundaries on its website.
There are also independent initiatives to map Catholic parish boundaries. For example, a user on Reddit has created an interactive map of US Catholic dioceses, with diocesan boundaries represented by white lines and provincial boundaries by black lines. The map also includes the locations of cathedrals, represented by globus cruciger symbols, and the names of dioceses in white text.
These mapping tools can be valuable resources for genealogical research, providing visual context and helping to identify the Catholic churches that existed in a particular neighbourhood or town. They can be used in conjunction with historical records to trace the locations and movements of ancestors.
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Frequently asked questions
The Archdiocese of Boston has an interactive Parish Boundary Map. This map can help you understand which Catholic churches existed in a particular neighbourhood or town in the greater Boston area.
The Roman Catholic Archdiocese of Atlanta has a Parishes by Boundaries Map. You can contact them via email or phone for more information.
The Diocese of Orange has a map of parishes assigned to residents of certain cities. You can contact the Pastoral Centre for more information.





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