# National Register of Historic Places listings in Union County, Ohio

This is a list of the National Register of Historic Places listings in Union County, Ohio.
It is intended to be a complete list of the properties and districts on the National Register of Historic Places in Union County, Ohio, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
There are 11 properties and districts listed on the National Register in the county.
This National Park Service list is complete through NPS recent listings posted February 28, 2025.
Download coordinates as:
* KML
* GPX (all coordinates)
* GPX (primary coordinates)
* GPX (secondary coordinates)

## Current listings

| | Name on the Register | Image | Date listed | Location | City or town | Description |
| 1 | Ellis Mounds | Ellis Mounds More images | July 30, 1974 (#74001638) | Within the triangle formed by Hillview Rd., Wolford-Maskill Rd., and State Route 4, northeast of Marysville 40°17′15″N 83°20′56″W﻿ / ﻿40.2875°N 83.3489°W﻿ / 40.2875; -83.3489﻿ (Ellis Mounds) | Paris Township | |
| 2 | Elmwood Place | Elmwood Place More images | November 29, 1979 (#79001972) | Southwest of Irwin on State Route 161 40°07′09″N 83°29′03″W﻿ / ﻿40.1192°N 83.4842°W﻿ / 40.1192; -83.4842﻿ (Elmwood Place) | Union Township | |
| 3 | The Fort | The Fort More images | July 8, 1982 (#82003662) | 26953 North Lewisburg Rd., northeast of North Lewisburg 40°13′55″N 83°33′01″W﻿ / ﻿40.2319°N 83.5503°W﻿ / 40.2319; -83.5503﻿ (The Fort) | Allen Township | |
| 4 | Gilcrist House | Gilcrist House | August 13, 1976 (#76001537) | 3.5 miles southeast of downtown Marysville off U.S. Route 33 40°12′30″N 83°18′53″W﻿ / ﻿40.2083°N 83.3147°W﻿ / 40.2083; -83.3147﻿ (Gilcrist House) | Marysville | Destroyed |
| 5 | Harmon Building-Ohio Reformatory for Women | Upload image | June 11, 2021 (#100006639) | 1479 Collins Ave. 40°13′34″N 83°23′34″W﻿ / ﻿40.2261°N 83.3927°W﻿ / 40.2261; -83.3927﻿ (Harmon Building-Ohio Reformatory for Women) | Marysville | |
| 6 | Dr. David W. Henderson House | Dr. David W. Henderson House More images | April 19, 2001 (#01000391) | 318 E. 5th St. 40°14′11″N 83°21′49″W﻿ / ﻿40.2364°N 83.3636°W﻿ / 40.2364; -83.3636﻿ (Dr. David W. Henderson House) | Marysville | |
| 7 | Marysville Historic District | Marysville Historic District | February 1, 1978 (#78002201) | Roughly bounded by Maple, Plum, 4th, and 7th Sts. 40°14′08″N 83°22′06″W﻿ / ﻿40.2356°N 83.3683°W﻿ / 40.2356; -83.3683﻿ (Marysville Historic District) | Marysville | |
| 8 | Marysville Light and Water Company Plan | Upload image | January 10, 2025 (#100011257) | 409 North Main Street. 40°14′28″N 83°22′02″W﻿ / ﻿40.241017°N 83.367123°W﻿ / 40.241017; -83.367123﻿ (Marysville Light and Water Company Plan) | Marysville | |
| 9 | Oakdale Cemetery Historic District | Upload image | April 15, 2024 (#100010203) | 1290 W. Fifth Street 40°14′32″N 83°23′38″W﻿ / ﻿40.2423°N 83.3940°W﻿ / 40.2423; -83.3940﻿ (Oakdale Cemetery Historic District) | Marysville | |
| 10 | Reuben L. Partridge House | Upload image | February 22, 2021 (#100006161) | 245 West 7th St. 40°14′02″N 83°22′13″W﻿ / ﻿40.2338°N 83.3702°W﻿ / 40.2338; -83.3702﻿ (Reuben L. Partridge House) | Marysville | |
| 11 | Reed Covered Bridge | Reed Covered Bridge More images | March 4, 1975 (#75001547) | 3.5 miles south of Marysville off State Route 38 40°08′59″N 83°22′50″W﻿ / ﻿40.1497°N 83.3806°W﻿ / 40.1497; -83.3806﻿ (Reed Covered Bridge) | Darby Township | 150-feet long Partridge truss bridge. Collapsed in 1993 |