Jefferson County
URL: https://knowledge.ivjn.us/en/places/ky-jefferson-county.html

Jefferson County is a county in Kentucky, United States, with county seat Louisville.

## Administrative divisions

Jefferson County is a county in Kentucky, United States; the county seat is Louisville[^uscb2023].

## Basic facts

- State: [Kentucky](https://knowledge.ivjn.us/en/places/kentucky.html)
- County seat: Louisville[^uscb2023]
- Division level: county[^uscb2023]

## Parent division

Located in [Kentucky](https://knowledge.ivjn.us/en/places/kentucky.html).

Updated: 2026-10-29

Relations:
- Located in: Kentucky https://knowledge.ivjn.us/en/places/kentucky.html
- Contains places: Louisville https://knowledge.ivjn.us/en/places/ky-louisville.html

Mentioned in:
- Kentucky https://knowledge.ivjn.us/en/places/kentucky.html

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