County ProfileIL
LaSalle County
Population: 109,658 · 25 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
109,658
People
Median age
42.2
Housing
Total households
45,373
Income
Median household income
$73,045
Housing
Total housing units
49,843
Employment
Employment rate
58%
Education
Bachelor’s degree or higher
20.5%
Healthcare
Insured population
96%
County details
Local time 00:52:34(CT)| Name | LaSalle |
|---|---|
| Total ZIP codes | 25total |
| ZIP codes (by type) | 19 Standard6 PO Box |
| Area code | 309, 779, 815, 861 |
| Timezone | Central Time (CT) |
| Coordinates | 41.3433407, -88.8859312 |
| Land area | 1,135.1 sq miles(2,939.9 km²) |
Map of LaSalle county, Illinois with ZIP codes
Cities and Communities in LaSalle County
Compare the largest cities in LaSalle County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Ottawa | 18,840 | $71,413 | 1ZIPs |
| Streator | 12,500 | $57,609 | 1ZIPs |
| La Salle | 10,375 | — | 1ZIPs |
| Peru | 9,896 | $74,808 | 1ZIPs |
| Mendota | 7,061 | $51,632 | 1ZIPs |
| Marseilles | 4,845 | $58,217 | 1ZIPs |
| Oglesby | 3,712 | $76,189 | 1ZIPs |
| Sheridan | 2,431 | $85,250 | 1ZIPs |
| Seneca | 2,353 | $86,830 | 1ZIPs |
| Utica | 1,976 | — | 1ZIPs |
| Earlville | 1,613 | $63,553 | 1ZIPs |
| Leland | 951 | $79,583 | 1ZIPs |
| Tonica | 749 | $90,000 | 1ZIPs |
| Millington | 617 | $81,775 | 1ZIPs |
| Grand Ridge | 515 | $78,929 | 1ZIPs |
| Lostant | 423 | $65,417 | 1ZIPs |
| Ransom | 308 | $82,500 | 1ZIPs |
| Cedar Point | 266 | $73,125 | 1ZIPs |
| Rutland | 259 | $60,625 | 1ZIPs |
| Troy Grove | 225 | $83,917 | 1ZIPs |
| Dana | 162 | $62,500 | 1ZIPs |
| Wedron | 140 | — | 1ZIPs |
| Serena | 129 | — | 1ZIPs |
| Leonore | 121 | $47,500 | 1ZIPs |
| Triumph | 100 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in LaSalle County
Review the most populated postal areas across LaSalle County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 61350 | Ottawa | $77,921 | 23,997 |
| 61364 | Streator | $59,060 | 18,449 |
| 61354 | Peru | $76,392 | 10,447 |
| 61301 | La Salle | $60,328 | 10,375 |
| 61342 | Mendota | $65,348 | 8,648 |
| 61341 | Marseilles | $72,530 | 8,092 |
| 60551 | Sheridan | $86,786 | 5,006 |
| 61348 | Oglesby | $76,369 | 4,576 |
| 60518 | Earlville | $69,980 | 3,325 |
| 61360 | Seneca | $95,093 | 3,306 |
| 61373 | Utica | $109,000 | 1,976 |
| 60531 | Leland | $79,808 | 1,879 |
| 61370 | Tonica | $91,094 | 1,317 |
| 61325 | Grand Ridge | $87,500 | 992 |
| 60549 | Serena | $108,417 | 666 |
| 61334 | Lostant | $86,250 | 642 |
| 60537 | Millington | $81,825 | 627 |
| 60470 | Ransom | $85,000 | 580 |
| 61358 | Rutland | $88,393 | 410 |
| 61316 | Cedar Point | $74,375 | 269 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS