Monmouth, Illinois
Monmouth is a city in Warren County, Illinois, with an estimated population of 8,567 in 2023. It sits at 40.9142, -90.6431 in the America/Chicago time zone.
| Field | Value |
|---|---|
| Place name | Monmouth |
| Type | city |
| State | Illinois (IL) |
| County | Warren County |
| Population (2023 est.) | 8,567 |
| Land area | 4.24 sq mi (10.99 km²) |
| Coordinates | 40.9142, -90.6431 |
| Time zone | America/Chicago |
| ZIP codes | 61462 |
ZIP codes and area codes for Monmouth
Monmouth covers 1 ZIP code: 61462. Browse all ZIP codes in Illinois for the full list.
Where is Monmouth?
Monmouth is located in Illinois, in Warren County. The coordinates above can be pasted directly into any map service. The nearest indexed places are listed below, which is a useful check when two states share a place name.
Nearby places
Kirkwood 10 km · ILLittle York 14 km · ILAlexis 18 km · ILBiggsville 20 km · ILRoseville 20 km · ILGalesburg 23 km · ILAbingdon 24 km · ILOquawka 26 km · IL
Other places in Warren County
Related
Frequently asked questions
What county is Monmouth, IL in?
Monmouth is in Warren County, Illinois.
What is the population of Monmouth, IL?
The 2023 Census Bureau estimate is 8,567.
What time zone is Monmouth in?
Monmouth is in the America/Chicago time zone.