Data as of November 4, 2026 · refreshed automatically from the official Indiana voter file
Johnson County, Indiana has 120,522 active registered voters across 139 precincts, as of November 2026.
Party registration
Indiana doesn't register voters by party, so there's no party breakdown to show. Party lean is usually inferred from primary participation; that data is in the voter file and available inside Motion51.
How Johnson County voted for president
Election results are public records.
Johnson County at a glance.
Johnson County had an estimated 170,614 residents in July 2024, the 11th most populous of Indiana's 92 counties, up 5.5% since the 2020 census. Of those, 129,850 are 18 or older, the voting-age population, and 16.3% are 65 or older. Its 120,522 active registered voters equal about 92.8% of that voting-age population.
It covers 320 square miles of land (532 people per square mile). The largest cities and towns are Greenwood (68,175), Franklin (26,158), Bargersville (11,283), New Whiteland (5,842) and Whiteland (5,511). The American Community Survey (2020-2024) puts it at a median age of 38.0, a median household income of $90,454, 34.7% of adults 25 and older holding a bachelor's degree or higher and 72.7% of occupied homes owned by the people living in them.
In 2024, 77,794 votes were cast for president, about 59.9% of the voting-age population; the Democratic ticket took 32.0% and the Republican ticket 66.3%. The two-party margin moved from R+25.4 in 2008 to R+34.3 in 2024.
- Population (2024 estimate)
- 170,614
- Population (2020 census base)
- 161,780
- Voting-age population (18+)
- 129,850
- Active voters per 100 adults
- 92.8
- Residents 65 and older
- 16.3%
- People per square mile
- 532
- Land area
- 320 sq mi
- Median age
- 38.0
- Median household income
- $90,454
- Adults 25+ with a bachelor's degree
- 34.7%
- Owner-occupied homes
- 72.7%
Largest cities and towns
- Greenwood 68,175
- Franklin 26,158
- Bargersville 11,283
- New Whiteland 5,842
- Whiteland 5,511
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 32.0% | 66.3% | R+34.3 | 77,794 |
| 2020 | 31.9% | 66.0% | R+34.1 | 77,618 |
| 2016 | 26.1% | 68.6% | R+42.5 | 66,229 |
| 2012 | 29.8% | 68.2% | R+38.4 | 57,362 |
| 2008 | 36.8% | 62.2% | R+25.4 | 58,644 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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