Illinois · Census place 1747150

Marseilles, Illinois

Marseilles is a city in LaSalle County, Illinois with an estimated 4,779 residents on July 1, 2024. It is the 337th largest of 651 incorporated places of 1,000+ people in the state.

Population 2024
4,779
#337 of 651 in Illinois
Change since 2020
-1.1%
-51 people
Land area
9.1 sq mi
+ 0.48 sq mi water
Density
528 / sq mi
State median 2,177
Orange pin: Marseilles. Shaded: its county. Dark pin: Springfield.

Measure from here

Tools and pages that start from Marseilles

Marseilles population, 2020 to 2024

Marseilles lost 51 residents from July 2020 to July 2024, a change of -1.1%. In the latest year it moved by -5.

4,83020204,81620214,77120224,78420234,7792024
July 1 estimates. The April 2020 estimates base was 4,841. The axis starts above zero so yearly changes are visible.

Marseilles covers 9.05 square miles of land and 0.48 of water, for 528 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Marseilles is less dense than the typical town.

What county Marseilles is in

All of Marseilles's residents live in LaSalle County, which had 108,390 residents in 2024. Marseilles holds 4.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Marseilles

1 ZIP Code Tabulation Area (ZCTA) overlaps Marseilles by at least 10% of the ZCTA's or the city's land: 61341. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Marseilles is

The Census internal point of Marseilles is at 41.282200, -88.681400. Springfield, the capital, is 115.5 miles SSW in a straight line. The nearest larger place is Ottawa, IL (18,775 people), 8.9 miles away. The nearest city of 100,000 or more is Joliet, IL, 32.1 miles away.

Internal point

Decimal
41.282200, -88.681400
DMS
41°16'55.92"N 88°40'53.04"W
UTM
16N 359193.9E 4571448.0N
Geohash
dp2fy50nj
Plus code
86HH78J9+VC

Daylight in Marseilles

At 41.28° N, Marseilles gets about 15 h 10 min of daylight around the June solstice and 9 h 12 min around the December solstice, a swing of 5 h 58 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Marseilles

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Seneca, 3.7 miles away, with 2,310 people.

Questions people ask

What is the population of Marseilles, IL?

4,779 on July 1, 2024, in the Census Vintage 2024 estimates. That is down 51 (1.1%) from 4,830 in July 2020.

What county is Marseilles in?

LaSalle County. All of its residents live in that county.

What ZIP codes cover Marseilles?

1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 61341.

How far is Marseilles from Springfield?

115.5 miles (185.9 km) in a straight line, heading SSW from Marseilles.

What is the nearest larger city to Marseilles?

Ottawa, IL, with 18,775 residents, 8.9 miles away between internal points.

Sources and data as of

Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.

  1. 01Census Vintage 2024 subcounty population estimates
  2. 02Census 2024 Gazetteer, places
  3. 03Census 2020 ZCTA to place relationship file
  4. 04Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.