---
{
  "adminArea": "United States · Illinois",
  "aliases": [
    "伊利诺伊州"
  ],
  "availableLangs": [
    "zh",
    "en"
  ],
  "categories": [
    "category-geography"
  ],
  "coordinates": {
    "latitude": 40.0417,
    "longitude": -89.1965
  },
  "createdAt": "2026-10-29T03:05:12+08:00",
  "id": "place_us_il",
  "lang": "en",
  "placeKind": "state",
  "revision": 3,
  "slug": "illinois",
  "sources": [
    {
      "id": "enwiki",
      "title": "Illinois (Wikipedia)",
      "url": "https://en.wikipedia.org/wiki/Illinois"
    },
    {
      "id": "uscb2023",
      "title": "U.S. Census Bureau 2023 FIPS state and county codes",
      "url": "https://www.census.gov/library/reference/code-lists/ansi.html"
    }
  ],
  "status": "published",
  "summary": "Illinois is a state of the United States with FIPS code 17 and capital Springfield.",
  "tags": [],
  "title": "Illinois",
  "type": "place",
  "updatedAt": "2026-10-29T03:05:12+08:00",
  "updatedBy": "user:admin"
}
---

# Illinois

Illinois is a state of the United States with FIPS code 17 and capital Springfield.

## Administrative divisions

Illinois is a state of the United States with FIPS state code 17[^uscb2023]. Below the state level are counties (or independent cities), then municipalities and neighborhoods[^uscb2023].

## Basic facts

- FIPS state code: 17[^uscb2023]
- Capital: Springfield[^enwiki]
- Population: about 12,549,689 (2023 estimate)[^uscb2023]
- Area: 149,995 km2[^enwiki]
- Admitted to the Union: 1818[^enwiki]
- Time zone: Central Time (UTC-6/-5)[^enwiki]
- ISO 3166-2: US-IL[^enwiki]

## Parent division

Located in [United States](/en/places/united-states.html).

## Subdivisions

Major counties: [Cook County](/en/places/il-cook-county.html), [DuPage County](/en/places/il-dupage-county.html), [Lake County](/en/places/il-lake-county.html), [Will County](/en/places/il-will-county.html), [Kane County](/en/places/il-kane-county.html).

Major cities: [Chicago](/en/places/il-chicago.html), [Aurora](/en/places/il-aurora.html), [Naperville](/en/places/il-naperville.html), [Joliet](/en/places/il-joliet.html).

更新时间：2026-10-29

## 标签


## 关系


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## 来源

- Illinois (Wikipedia)：https://en.wikipedia.org/wiki/Illinois 
- U.S. Census Bureau 2023 FIPS state and county codes：https://www.census.gov/library/reference/code-lists/ansi.html