Mahoning Avenue Historic District
Also known as: See Also:Mahoning Avenue Historic District (Boundary Increas
Why it's listed
Mahoning Avenue Historical Area is a group of four mansions on a bluff above the Mahoning River, just northwest of Warren's courthouse square. Once part of a grand boulevard of large homes, the row survives as one of Ohio's few largely unchanged "Millionaires' Rows." The Smith House, built in 1828 by master builder Isaac Ladd for merchant and state senator Leicester King, is Federal in style. The Kinsman House, a Greek Revival brick mansion of 1832, stands beside Frederick Kinsman's small law and land office. The Perkins House, an 1871 Italianate residence, hosted Grant, Garfield, Hayes, Harrison and McKinley. Together the buildings show the builder's art from the Federal through the Victorian periods and reflect Warren's political, business and social life. Most now serve public purposes, including county offices and city hall, and the grounds still hold some exotic plantings and green space.
Significance in brief: The nomination calls it the finest assemblage of historically and architecturally important structures in Trumbull County and one of Ohio's few largely unchanged "Millionaires' Rows." The houses span the Federal through Victorian periods and are tied to prominent political and business figures, including Leicester King, Frederick Kinsman and Henry B. Perkins. Several presidents and national political figures visited them.
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 71000656, listed October 26, 1971. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | 241-391 Mahoning Ave., NW., Warren |
|---|---|
| County | Trumbull County |
| Listed | October 26, 1971 |
| Reference number | 71000656 |
| Resource type | District |
| Period of significance | 19th Century (specific dates 1828, 1832 & 1871) |
| Architect / builder | Isaac Ladd (master builder of the Smith House); Perkins House architect unknown |
| Architectural style | Federal (Smith House), Greek Revival (Kinsman House and Law Office), Victorian Italianate (Perkins House) |
| Areas of significance | Politics/Government, Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | Kinsman House under restoration for county offices and preservation association use; Kinsman Law and Land Office and Perkins House (Warren City Hall) in public use; Smith House altered but restorable and in private office use. |
| Acreage | 4 |
| Within district | Mahoning Avenue Historic District (Boundary Increase) |
| Coordinates | 41.23841, -80.82209 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
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 71000656.
- Nomination form (PDF, National Archives) — catalog entry
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.