Old County Courthouse
Also known as: Plymouth Old County Courthouse; Old Town House
Why it's listed
Standing at the corner of Leyden and Market Streets on Town Square in Plymouth, this two-story frame building dates to 1749 and is described as one of the oldest local government buildings still standing in the United States. It replaced a court house of 1670 that had been added to an earlier "country house," and local historians believe the older vaulted ceiling and roof were reused. Peter Oliver of Middleboro, a judge of the Court of Common Pleas, designed it. The county and town shared the building, with the courtroom upstairs, town offices on the first floor and a market in the basement. The site has been publicly owned since 1620. Over time the rooms housed schools, the public library, church services and nearly every town department. The town became sole owner in 1821. A HUD grant paid for restoration to its 1749 appearance, including twelve-over-twelve windows and a five-bay front facade, and a museum of town history was being created inside.
Significance in brief: The nomination calls it one of the oldest local government buildings still standing in the United States. Its site has been publicly owned since 1620 and has served as a colonial capitol, county court house, probate court, registry of deeds and town house. The building was designed by Peter Oliver of Middleboro, and it has been restored to its 1749 appearance.
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 72001297, listed February 23, 1972. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | Leyden and Market Sts., Plymouth |
|---|---|
| County | Plymouth County |
| Listed | February 23, 1972 |
| Reference number | 72001297 |
| Resource type | Building |
| Period of significance | 1749 |
| Architect / builder | Peter Oliver of Middleboro (designer) |
| Areas of significance | Politics/Government |
| Level of significance | Local |
| Status (as stated in the nomination) | Described as in excellent condition and restored to its 1749 appearance with HUD grant aid; a second-floor courtroom was to be open to visitors and a town history museum was being created on the first floor. |
| Acreage | 0.5 |
| Coordinates | 41.95559, -70.66408 (NPS GIS) |
What listing means for this property
For a publicly owned building or structure, listing mainly matters when federal funds, permits or licences are involved: projects then go through Section 106 review so effects on the property are considered. Listing also strengthens applications for preservation grants and, for leased income-producing uses, can enable the federal rehabilitation tax credit.
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 72001297.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7083773
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.