Callahan House
Also known as: Jacob Helm House
Why it's listed
Built in two sections beside the Sawkill Creek in Milford, Pike County, Pennsylvania, the Callahan House is a long, one-and-a-half story frame clapboard dwelling. The front section dates from the late eighteenth century, and the rear addition was built probably no later than about 1820. Both parts have steep gable roofs and wide brick chimneys at each end, with chimney backs exposed at first-floor level, a regional Dutch building practice. Original features include slender porch posts, beaded ceiling boards, an eight-panel entrance door, end-fireplace mantels with simple geometric moldings, and original floorboards. The house is regarded as one of the best preserved examples of the earliest frontier house type on the Pennsylvania side of the Upper Delaware Valley. Its plain form contrasts with later farmhouses and Victorian homes in nearby Milford. Local tradition claims it served as an inn and an Underground Railroad station, though the evidence for these claims has not been established.
Significance in brief: The nomination argues the house is one of the best preserved examples of the earliest type of frontier house on the Pennsylvania side of the Upper Delaware Valley, with a plain simplicity that contrasts with later farmhouses and Victorian homes in nearby Milford. Local tradition holds it was an inn and a station on the Underground Railroad, but the document states these claims are unproven and treats the house's significance as an unspectacular but historically important connection to the region's history.
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 79000244, listed July 23, 1979. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | U.S. 29, Milford |
|---|---|
| County | Pike County |
| Listed | July 23, 1979 |
| Reference number | 79000244 |
| Resource type | Building |
| Areas of significance | Architecture, Social History |
| Level of significance | Local |
| Status (as stated in the nomination) | The house is in good condition, with a substantial amount of original interior detail remaining; its alignment is perpendicular to U.S. 209 and it sits about ten feet below the highway. |
| Acreage | 2 |
| Coordinates | 41.31687, -74.79997 (NPS GIS) |
What listing means for this property
National Register listing is honorary for a privately owned home: it does not by itself restrict what an owner may do with their own money, and it does not require public access. Restrictions come from local landmark or historic-district ordinances, which are separate (how they differ).
Owner-occupied houses are not eligible for the 20% federal rehabilitation tax credit, which applies to income-producing buildings, but many states offer credits for homeowners. Listing also opens the door to preservation easements and to buying a plaque. Start with what listing means for homeowners, renovating a listed house and selling one.
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 79000244.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5021722
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.