LaSalle County GIS Maps

LaSalle County Maps

The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.

County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.

LaSalle County Population

LaSalle County had 109,658 residents in 2020. That was 3.7% lower than in 2010. LaSalle County had 1,851 fewer people in 2020 than it did in 2000, which points to a long-term population decline. Ottawa is the largest city in the county, but it accounts for only about 17% of the total population. The county is fairly spread out, with about 97 people per square mile. Some of the county's most populated postal areas include Ottawa, Streator and Peru.

Population Trend in LaSalle County IL

LaSalle County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

LaSalle County Zip Codes

LaSalle County has 26 zip codes. Some of the county's most populated zip codes include Ottawa (61350), Streator (61364) and Peru (61354). Ottawa is the largest zip by population, with about 23,997 residents or 22% of the county total. Together, the three largest zips account for about 48% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in LaSalle County IL

LaSalle County Zip Code populations and trends per most recent census data.

LaSalle County Demographics

LaSalle County has a median age of 42.1, which makes the county a little older than Illinois overall. About 21.3% of residents are under 18, while 19.4% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 30.3% of the population, which points to a solid working-age base. About 18.7% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.

Key Demographics for LaSalle County IL

LaSalle County School Districts

LaSalle County is served by 8 public school districts with 5,620 students enrolled in 2024. The largest districts on the county map are Sandwich Community Unit 430, Fieldcrest Community Unit 6 and Putnam County Community Unit 535. Those three districts account for about 62% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.

Largest School Districts by Enrollment in LaSalle County IL

LaSalle County school district enrollment and trends per most recent NCES reporting data.

LaSalle County Housing & Real Estate

LaSalle County has a median home value of $154,900 and a median gross rent of $906. About 74% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Illinois median, while rents come in below the state average. In March 2026, the median listing price was $215,475 and homes spent about 53 days on the market.

Businesses in LaSalle County, IL

LaSalle County has 5,435 business listings across 679 categories. The largest categories in LaSalle County business listings are Churches & Religious Organizations (130, 2.4%), Bars & Nightlife (99, 1.8%), and Parks & Recreation (92, 1.7%). The full LaSalle County business listings dataset includes names, categories, addresses and contact details where available. LaSalle County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in LaSalle County, IL

LaSalle County Business Listings

LaSalle County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

LaSalle County Basemaps

LaSalle County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.

Preview a Live Package Demo

See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from Illinois — explore the full structure before you buy.