# National Register of Historic Places listings in Mercer County, Illinois

This is a list of the National Register of Historic Places listings in Mercer County, Illinois.
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Mercer County, Illinois, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a map.
There are 12 properties and districts listed on the National Register in the county. Another property was once listed but has been removed.
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 |
| 1 | Commercial House | Commercial House | May 9, 1983 (#83000332) | 5th and Main St. 41°06′03″N 90°56′32″W﻿ / ﻿41.1008°N 90.9421°W﻿ / 41.1008; -90.9421﻿ (Commercial House) | Keithsburg |
| 2 | Downtown Aledo Historic District | Downtown Aledo Historic District More images | June 7, 2016 (#16000328) | 100-200 blocks N. College, 100, 200, 300 blocks S. College, 100 blk. NW. 2nd, 200 blk. SW. 2nd Aves. 41°12′05″N 90°44′57″W﻿ / ﻿41.2015°N 90.7492°W﻿ / 41.2015; -90.7492﻿ (Downtown Aledo Historic District) | Aledo |
| 3 | Gideon Ives House | Gideon Ives House | November 8, 2000 (#00001332) | 408 E. Jefferson St. 41°10′10″N 90°59′39″W﻿ / ﻿41.1694°N 90.9942°W﻿ / 41.1694; -90.9942﻿ (Gideon Ives House) | New Boston |
| 4 | Keithsburg Historic District | Keithsburg Historic District | May 8, 1986 (#86001004) | Roughly bounded by Jackson, 5th, Washington, and 3rd Sts. 41°06′03″N 90°56′32″W﻿ / ﻿41.1008°N 90.9422°W﻿ / 41.1008; -90.9422﻿ (Keithsburg Historic District) | Keithsburg |
| 5 | Lock and Dam No. 17 Historic District | Lock and Dam No. 17 Historic District More images | March 10, 2004 (#04000177) | 173 Lock and Dam Rd. 41°11′31″N 91°03′29″W﻿ / ﻿41.1919°N 91.0581°W﻿ / 41.1919; -91.0581﻿ (Lock and Dam No. 17 Historic District) | New Boston |
| 6 | Mercer County Courthouse | Mercer County Courthouse | June 17, 1982 (#82002589) | 100 SE 3rd St. 41°11′58″N 90°44′55″W﻿ / ﻿41.1994°N 90.7486°W﻿ / 41.1994; -90.7486﻿ (Mercer County Courthouse) | Aledo |
| 7 | Mercer County Fairgrounds | Mercer County Fairgrounds | May 2, 1997 (#97000380) | 12th Ave., SW., .5 mi. S of jct. with IL 17 41°11′30″N 90°45′52″W﻿ / ﻿41.1917°N 90.7644°W﻿ / 41.1917; -90.7644﻿ (Mercer County Fairgrounds) | Aledo |
| 8 | Mercer County Jail | Mercer County Jail | July 25, 1997 (#97000816) | 309 S. College Ave. 41°11′57″N 90°44′58″W﻿ / ﻿41.1992°N 90.7494°W﻿ / 41.1992; -90.7494﻿ (Mercer County Jail) | Aledo |
| 9 | Sherrard Banking Company | Sherrard Banking Company | February 16, 1996 (#96000092) | 314 Third St. 41°19′08″N 90°30′20″W﻿ / ﻿41.3189°N 90.5056°W﻿ / 41.3189; -90.5056﻿ (Sherrard Banking Company) | Sherrard |
| 10 | James S. Thompson House | James S. Thompson House | December 3, 2002 (#02000846) | 804 North St. 41°10′27″N 90°59′46″W﻿ / ﻿41.1743°N 90.996°W﻿ / 41.1743; -90.996﻿ (James S. Thompson House) | New Boston |
| 11 | Verdurette | Upload image | June 17, 2021 (#100005658) | 665 65th Ave. 41°09′59″N 90°57′44″W﻿ / ﻿41.1663°N 90.9622°W﻿ / 41.1663; -90.9622﻿ (Verdurette) | New Boston |
| 12 | Levi Willits House | Levi Willits House | April 20, 1995 (#95000488) | 202 Main St. 41°10′07″N 90°59′59″W﻿ / ﻿41.1686°N 90.9997°W﻿ / 41.1686; -90.9997﻿ (Levi Willits House) | New Boston |

## Former listing

| | Name on the Register | Image | Date listed | Date removed | Location | City or town | Description |
| 1 | United Presbyterian Church | Upload image | November 7, 1980 (#80001398) | July 17, 1984 | Main and 8th Sts. | Keithsburg | |