• county
  • FIPS 17143
  • Largest town: Peoria

Peoria County, Illinois

Peoria County had 179,630 residents in the Census Vintage 2024 estimate, on 618.7 square miles of land. It ranks 12th of 102 in Illinois by population and 32nd by land area.

Population
179,630
#12 of 102 in Illinois · #388 in US
Area
618.7 sq mi
#32 of 102 in Illinois · #1,556 in US
Density
290 / sq mi
#12 of 102 in Illinois · #445 in US
Median household income
$62,873
#69 of 102 in Illinois · #1,571 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Peoria County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Peoria County

Peoria County population, land area and income

Peoria County had 179,630 residents in the Census Vintage 2024 estimate, on 618.7 square miles of land. It ranks 12th of 102 in Illinois by population and 32nd by land area. That works out to 290.3 people per square mile, 3.0 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Illinois has 24,447 residents, so Peoria County is 7.3 times that size.

Its SAIPE 2023 median household income of $62,873 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

179,630

3144th1st

388th of 3,144 (US)

Land area

619 sq mi

3144th1st

1556th of 3,144 (US)

Density

290.3 / sq mi

3144th1st

445th of 3,144 (US)

Median household income

$62,873

3143rd1st

1571st of 3,143 (US)

Rank within Illinois (102)

Population

179,630

102nd1st

12th of 102 (IL)

Land area

619 sq mi

102nd1st

32nd of 102 (IL)

Density

290.3 / sq mi

102nd1st

12th of 102 (IL)

Median household income

$62,873

102nd1st

69th of 102 (IL)

How Peoria County's population changed since 2020

Peoria County lost 1,882 residents between the July 2020 and July 2024 estimates, a drop of 1.0%. That ranks 33rd of 102 in Illinois for growth. The median Illinois county changed by -1.7%, and the state as a whole by -0.7%.

Since the April 2020 estimates base, Peoria County recorded 8,886 births and 8,777 deaths, a natural change of +109. Net international migration added +3,890 and net domestic migration, people moving to or from other US counties, came to -6,381. The largest single component was domestic migration, which removed 6,381 people.

181.5k2020179.8k2021178.5k2022178.7k2023179.6k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
8,886
Deaths
8,777
Net international migration
+3,890
Net domestic migration
-6,381
Change, July 2023 to July 2024
+895

Where Peoria County is

The Census internal point of Peoria County is at 40.786000, -89.767000. It sits in UTM zone 16N. The map shades Illinois's 102 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Peoria County outlined. Dots are towns of 1,000+ people with residents in it.

Piatt County: -0.3%Hamilton County: -2.2%Williamson County: -0.1%Edgar County: -2.4%Macoupin County: -2.3%Marshall County: -1.3%Putnam County: +0.0%Richland County: -2.8%Washington County: -1.4%Lee County: -1.5%Douglas County: +0.2%Cook County: -1.6%Effingham County: -0.3%Edwards County: -3.6%Cass County: -2.0%Clay County: -3.4%Knox County: -2.2%LaSalle County: -0.9%Cumberland County: -1.3%Warren County: -3.7%Moultrie County: -0.9%Menard County: -2.5%Fayette County: -1.5%Boone County: -0.0%Lawrence County: -3.2%Marion County: -3.2%Champaign County: +3.0%Clark County: -2.4%Ford County: -0.4%Wayne County: -1.4%Logan County: -1.4%Grundy County: +2.5%Jasper County: -1.8%Crawford County: -1.3%McDonough County: -1.7%Clinton County: +0.5%Perry County: -3.0%Montgomery County: -2.2%Henry County: -2.0%Livingston County: -1.2%Scott County: -3.8%Alexander County: -11.2%Bureau County: -2.2%Brown County: +1.1%Mason County: -3.9%Calhoun County: -4.1%Greene County: -4.3%Coles County: -1.4%Kendall County: +8.2%Lake County: +0.7%Mercer County: -2.2%St. Clair County: -2.3%Wabash County: -3.0%Bond County: -1.7%DuPage County: +0.6%Gallatin County: -5.2%Stephenson County: -3.3%McHenry County: +1.9%White County: -3.0%Saline County: -3.9%Christian County: -2.2%Sangamon County: -1.0%Massac County: -3.6%Macon County: -2.9%Johnson County: -0.0%Jo Daviess County: -2.6%Peoria County: -1.0%DeKalb County: +1.0%Pope County: -1.5%De Witt County: -0.9%Schuyler County: -1.7%Fulton County: -3.1%Ogle County: -0.8%Jersey County: -1.6%Iroquois County: -3.3%Kankakee County: -0.9%Rock Island County: -1.1%Pulaski County: -5.8%Kane County: +0.9%Union County: -2.4%Whiteside County: -1.7%Woodford County: -0.3%Carroll County: -1.5%Adams County: -2.3%Hardin County: -2.6%Madison County: -1.0%Hancock County: -3.1%Monroe County: +0.0%Tazewell County: -1.1%Jackson County: -0.1%Vermilion County: -3.9%Randolph County: -0.6%McLean County: +0.5%Morgan County: -2.6%Shelby County: -1.7%Will County: +1.7%Winnebago County: -0.4%Jefferson County: -2.4%Stark County: -2.2%Henderson County: -4.5%Pike County: -2.6%Franklin County: -1.8%
Change 2020 to 2024
  1. < -3.0%
  2. < -2.2%
  3. < -1.4%
  4. < -0.3%
  5. ≥ -0.3%
no data

Orange pin: Peoria County internal point. Dark pin: Springfield.

Internal point

Decimal
40.786000, -89.767000
DMS
40°47'9.60"N 89°46'1.20"W
UTM
16N 266526.6E 4518685.7N
Geohash
dp20j2cet
Plus code
86GGQ6PM+C6

Towns in Peoria County

10 incorporated places of 1,000+ people have residents in Peoria County, 142,097 people together, or 79% of the county. Each figure counts only the part of the town inside Peoria County; towns marked "part" extend into another county. The largest is Peoria with 111,696.

  1. 01Peoria111,696
  2. 02Chillicothe6,052
  3. 03Bartonville5,836
  4. 04Peoria Heights5,802
  5. 05West Peoria4,204
  6. 06Elmwood2,041
  7. 07Bellevue1,903
  8. 08Princeville1,719
  9. 09Dunlap1,596
  10. 10Hanna City1,248
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Peoria County

The Census 2024 county adjacency file lists 6 neighbors for Peoria County. The most populous is Tazewell County, IL, with 129,821 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 69.7 miles S of Peoria County's internal point in a straight line. The nearest place of 100,000 or more is Peoria, IL (population 111,696), 8.2 miles away.

Peoria County FIPS code

The FIPS code of Peoria County is 17143: state code 17 for Illinois plus county code 143. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $62,873.

Questions people ask

What is the population of Peoria County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 179,630. That is down 1,882 people (1.0%) from the July 2020 estimate of 181,512.

What is the FIPS code of Peoria County?

17143. The first two digits (17) are Illinois; the last three (143) identify the county.

What is the largest town in Peoria County?

Peoria, with 111,696 residents inside Peoria County in 2024.

Which counties border Peoria County?

6 county-equivalents border it in the Census 2024 adjacency file: Tazewell County, IL; Knox County, IL; Woodford County, IL; Fulton County, IL; Marshall County, IL; Stark County, IL.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

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