Location of Jefferson, Iowa
| • Estimate |
|Time zone||UTC-6 (Central (CST))|
|• Summer (DST)||UTC-5|
|Website||City of Jefferson|
Jefferson is a city in Iowa in the United States. It is the county seat of Greene County. The number of people living in Jefferson was 4,345 at the 2010 census. It is the home of the Mahanay Memorial Bell Tower, which is in the town square, and can be seen for miles.