Polk Township is one of thirteen townships in Washington County, Indiana, United States. As of the 2020 census, its population was 2,708 and it contained 1,084 housing units.

Historical population

Census	Pop.	Note	%±
1890	919		—
1900	1,111		20.9%
1910	1,035		−6.8%
1920	986		−4.7%
1930	1,092		10.8%
1940	1,236		13.2%
1950	1,177		−4.8%
1960	1,362		15.7%
1970	1,384		1.6%
1980	1,682		21.5%
1990	1,863		10.8%
2000	2,394		28.5%
2010	2,626		9.7%
2020	2,708		3.1%
Source: US Decennial Census

According to the 2010 census, the township has a total area of 35.99 square miles (93.2 km), of which 35.84 square miles (92.8 km) (or 99.58%) is land and 0.15 square miles (0.39 km) (or 0.42%) is water.

• New Pekin (east half)

• Bartle at 38°33′37″N 85°53′15″W / 38.560338°N 85.887470°W / 38.560338; -85.887470
• Blue River at 38°31′48″N 85°56′22″W / 38.530060°N 85.939416°W / 38.530060; -85.939416
• Daisy Hill at 38°30′22″N 85°56′22″W / 38.506172°N 85.939416°W / 38.506172; -85.939416
• Old Pekin at 38°29′50″N 86°00′12″W / 38.497282°N 86.003307°W / 38.497282; -86.003307

(This list is based on USGS data and may include former settlements.)

• Franklin Township (north)
• Finley Township, Scott County (northeast)
• Monroe Township, Clark County (east)
• Wood Township, Clark County (south)
• Jackson Township (southwest)
• Pierce Township (west)
• Washington Township (northwest)

The township contains these three cemeteries: Mead, Mount Pleasant and Tash.

• East Washington School Corporation

• Indiana's 9th congressional district
• State House District 73
• State Senate District 45

• United States Census Bureau 2007 TIGER/Line Shapefiles
• United States Board on Geographic Names (GNIS)
• IndianaMap

• Indiana Township Association
• United Township Association of Indiana