Mercer County, Illinois ZIP codes
13 ZIP codes are in Mercer County, plus 5 that cross in from neighboring counties. It's part of the Davenport-Moline-Rock Island, IA-IL metro area.
- ZIP codes
- 13
- Population in these ZIPs
- 16,648
- Avg. median income
- $76,100population-weighted
- Cities & towns
- 13
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Mercer County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 61231 | Aledo | 4,962 | $70,991 | $177,100 |
| 61260 | Joy | 737 | $41,645 | $159,900 |
| 61263 | Matherville | 657 | $86,500 | $141,500 |
| 61272 | New Boston | 1,437 | $64,167 | $148,600 |
| 61276 | Preemption | 88 | $87,750 | $89,000 |
| 61279 | Reynolds | 1,015 | $87,656 | $203,200 |
| 61281 | Sherrard | 2,520 | $102,639 | $255,800 |
| 61412 | Alexis | 1,392 | $82,143 | $151,300 |
| 61442 | Keithsburg | 504 | $48,750 | $89,800 |
| 61465 | New Windsor | 1,192 | $56,875 | $162,800 |
| 61466 | North Henderson | 263 | $73,462 | $90,000 |
| 61476 | Seaton | 551 | $88,264 | $122,500 |
| 61486 | Viola | 1,330 | $78,889 | $173,300 |
ZIP codes partly in Mercer County
These ZIP codes are mostly in a neighboring county but cover part of Mercer County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 61259 | Illinois City | Rock Island County | 1,053 | $91,458 | $278,700 |
| 61262 | Lynn Center | Henry County | 1,197 | $86,250 | $267,800 |
| 61264 | Milan | Rock Island County | 10,073 | $78,068 | $189,300 |
| 61273 | Orion | Henry County | 3,120 | $99,032 | $224,900 |
| 61472 | Rio | Knox County | 453 | $76,500 | $150,000 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Mercer County
Nearby counties
Frequently asked questions
How many ZIP codes are in Mercer County, Illinois?
13 ZIP codes are mainly in Mercer County, and 5 more ZIP codes from neighboring areas reach partly into it.
What cities are in Mercer County?
ZIP codes in Mercer County use the city names Aledo, Alexis, Joy, Keithsburg, Matherville, New Boston, New Windsor, North Henderson, Preemption, Reynolds, Seaton and Sherrard and others.
What metro area is Mercer County in?
Mercer County is part of the Davenport-Moline-Rock Island, IA-IL metropolitan statistical area.