Old McHenry County Courthouse
Also known as: Old Courthouse and Jail
Why it's listed
Overlooking the public square in Woodstock, Illinois, the old McHenry County Courthouse is a brick building with limestone trim, laid out on a Greek cross plan and topped by a wooden cupola. It was finished in the winter of 1858 to designs by John Mills Van Osdel, described as Chicago's first and most important early architect. Brick pilasters, stone window heads and a stone entrance give it an Italianate character. Later one-story additions filled two corners of the cross, but the exterior is otherwise little changed. A brick jail with Joliet limestone trim was added to the north in 1887 and held labor leader Eugene Debs before his trial in the 1890s. The courthouse is regarded as one of very few elegant pre-Civil War Italianate courthouses remaining in the Midwest. It served as the seat of county government and law for over a century and has since been renovated for shops while keeping its principal interior spaces.
Significance in brief: The courthouse is a large, well-designed pre-Civil War Italianate building by Chicago's first architect, J.M. Van Osdel, and one of very few such courthouses left in the Midwest. It survives in a relatively unchanged condition and is the largest structure on the Woodstock square. It served as the seat of county government and law for over a century. The jail is noted for holding Eugene Debs before his trial in the 1890s.
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 74002183, listed November 1, 1974. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | City Sq., Woodstock |
|---|---|
| County | McHenry County |
| Listed | November 1, 1974 |
| Reference number | 74002183 |
| Resource type | Building |
| Period of significance | 19th Century (specific date 1857) |
| Architect / builder | John Mills Van Osdel (Van Osdel and Baumann) for the courthouse; R.J. Beck, contractor, for the 1887 jail |
| Architectural style | Italianate |
| Areas of significance | Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | Condition listed as excellent and altered; the building has been renovated for shops, with the most important interior spaces retained. |
| Acreage | 0.7 |
| Within district | Woodstock Square Historic District |
| Coordinates | 42.31491, -88.44832 (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 74002183.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7084495
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.