National Register listings in Mercer County, Illinois
Most notable listings
Commercial House Keithsburg · Building · listed 1983 
Ives, Gideon, House New Boston · Building · listed 2000 
Keithsburg Historic District Keithsburg · District · listed 1986 
Lock and Dam No. 17 Historic District New Boston · District · listed 2004 
Mercer County Courthouse Aledo · Building · listed 1982 
Mercer County Fairgrounds Aledo · District · listed 1997 
Mercer County Jail Aledo · Building · listed 1997 
Sherrard Banking Company Sherrard · Building · listed 1996 
Thompson, James S., House New Boston · Building · listed 2002 
Willits, Levi, House New Boston · Building · listed 1995 Historic districts (5)
- Downtown Aledo Historic District — Aledo
- Keithsburg Historic District — Keithsburg
- Lock and Dam No. 17 Historic District — New Boston
- Mercer County Fairgrounds — Aledo
- Verdurette — New Boston
All listings
Places: New Boston (5) · Aledo (4) · Keithsburg (2) · Sherrard (1)
| Name | Place | Type | Listed |
|---|---|---|---|
| Commercial House | Keithsburg | Building | 1983 |
| Downtown Aledo Historic District | Aledo | District | 2016 |
| Ives, Gideon, House | New Boston | Building | 2000 |
| Keithsburg Historic District | Keithsburg | District | 1986 |
| Lock and Dam No. 17 Historic District | New Boston | District | 2004 |
| Mercer County Courthouse | Aledo | Building | 1982 |
| Mercer County Fairgrounds | Aledo | District | 1997 |
| Mercer County Jail | Aledo | Building | 1997 |
| Sherrard Banking Company | Sherrard | Building | 1996 |
| Thompson, James S., House | New Boston | Building | 2002 |
| Verdurette | New Boston | District | 2021 |
| Willits, Levi, House | New Boston | Building | 1995 |
State Historic Preservation Office
Nominations, tax-credit certifications and official records for Illinois go through the Illinois State Historic Preservation Office. See how to nominate a property.