Jefferson County at a glance
Jefferson County is one of 120 county-level areas in Kentucky. Its 380.8 square miles of land place it at position 38 among those areas by land size. Including 16.8 square miles of water, its mapped total area is approximately 397.6 square miles.
| Full Census name | Jefferson County |
|---|---|
| State | Kentucky |
| FIPS / GEOID | 21111 |
| Boundary vintage | 2025 |
| Outline source scale | 1:500,000 |
Counties along the boundary
These county-level areas share a line segment with Jefferson County in the Census cartographic boundary dataset. Select one to continue exploring.
- Clark CountyIndiana
- Floyd CountyIndiana
- Harrison CountyIndiana
- Bullitt CountyKentucky
- Hardin CountyKentucky
- Oldham CountyKentucky
- Shelby CountyKentucky
- Spencer CountyKentucky
Looking for another Jefferson County?
The short name “Jefferson” also appears elsewhere. The state and FIPS code distinguish this area.
- Jefferson County, Florida
- Jefferson County, Georgia
- Jefferson County, Idaho
- Jefferson County, Illinois
- Jefferson County, Indiana
- Jefferson County, Iowa
- Jefferson County, Kansas
- Jefferson Parish, Louisiana
- Jefferson County, Mississippi
- Jefferson County, Missouri
- Jefferson County, Montana
- Jefferson County, Nebraska
- Jefferson County, New York
- Jefferson County, Ohio
- Jefferson County, Oklahoma
- Jefferson County, Oregon
- Jefferson County, Pennsylvania
- Jefferson County, Tennessee
- Jefferson County, Texas
- Jefferson County, Washington
- Jefferson County, West Virginia
- Jefferson County, Wisconsin
- Jefferson County, Arkansas
- Jefferson County, Colorado
- Jefferson County, Alabama
Using this map
Choose a blank outline for coloring or a labelled download for reference. SVG preserves editable boundary artwork, PNG works in slides, and PDF provides a ready-to-print landscape page. Use the full state map to compare surrounding counties.
Roads, topography, and aerial imagery are available in the interactive background viewer. Those backgrounds have their own dates and sources; the red boundary overlay follows the 2025 Census geography.
Sources and precision
U.S. Census Bureau, 2025 Cartographic Boundary Files. The county outline uses the 1:500,000 file; location maps and interactive overlays use 1:5,000,000. Areas come from ALAND and AWATER, converted to square miles and rounded to one decimal place. Neighbor links are calculated from shared boundary segments, not from point-only contacts. Generalized maps are for geographic reference, not parcel or legal boundary determination. Full methodology.