St. Milachi Church
Also known as: Site #46-1
Why it's listed
Stuccoed stone Catholic mission church on about two acres in Londonderry Township, Chester County, above the Doe Run valley. Work on the first church began in 1800 and was completed in 1838, with the carpenter John Ferron and stonework by the Maguires and Henry Ferron. The plain one-story building has a gable roof, nine-over-nine windows, and a simple wooden cross on the gable peak. Its interior keeps plain plaster walls, wooden pews with entrance doors, and interior wooden shutters. The adjoining cemetery contains marble tombstones, the earliest dated 1771, with Irish surnames such as Maguire, Dougherty, and Ferron. The church is regarded as the oldest Catholic mission church still in use in southeastern Pennsylvania outside Philadelphia. It never closed during its history, and it reflects early Irish Catholic settlement in an area where Catholics faced hostility under the colonial government.
Significance in brief: The nomination argues the church is the oldest Catholic mission church still in use in southeastern Pennsylvania outside Philadelphia, and that its 18th-century establishment in a remote area indicates early Irish Catholic settlement, which was rare in Penn's original counties. Its cemetery holds a 1771 tombstone, and the church has remained a mission in continuous service despite periods of only quarterly or monthly services.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 85002376, listed September 16, 1985. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | St. Milachi Rd., Londonderry Twp. |
|---|---|
| County | Chester County |
| Listed | September 16, 1985 |
| Reference number | 85002376 |
| Resource type | Building |
| Period of significance | 1800-1899 |
| Architect / builder | John Ferron (carpenter); Maguires and Henry Ferron (stonework) |
| Areas of significance | Religion |
| Level of significance | Local |
| Status (as stated in the nomination) | Church in use; services held weekly |
| Acreage | 2 |
| Coordinates | 39.89683, -75.84888 (NPS GIS) |
What listing means for this property
Religious properties are listed for their architectural or historical significance, not their religious use. Listing is honorary and does not restrict the congregation's use of the building. The federal rehabilitation credit is generally unavailable unless part of the building is income-producing; some state programmes and preservation grants do cover religious buildings. Federal funding or permits trigger Section 106 review.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 85002376.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7589844
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.