Decatur, Indiana

Decatur population, 2020 to 2024

Decatur added 136 residents from July 2020 to July 2024, a change of +1.4%. In the latest year it moved by -11. Among 126 Indiana places of 5,000 or more, that growth ranks 60th; the median place changed by +1.0%. The median place of 5,000+ in Indiana has 14,565 people, so Decatur is 69% of it.

Decatur covers 6.10 square miles of land, for 1,651 people per square mile of land. The median Indiana place of 5,000+ has 1,645, so Decatur is close to the typical town.

What county Decatur is in

All of Decatur's residents live in Adams County, which had 36,584 residents in 2024. Decatur holds 27.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Decatur

1 ZIP Code Tabulation Area (ZCTA) overlaps Decatur by at least 10% of the ZCTA's or the city's land: 46733. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Decatur is

The Census internal point of Decatur is at 40.828900, -84.927800. Indianapolis, the capital, is 97.8 miles SW in a straight line. The nearest larger place is Bluffton, IN (10,556 people), 14.1 miles away. The nearest city of 100,000 or more is Fort Wayne, IN, 21.1 miles away.

Daylight in Decatur

At 40.83° N, Decatur gets about 15 h 07 min of daylight around the June solstice and 9 h 15 min around the December solstice, a swing of 5 h 52 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Decatur

The eight nearest incorporated places of 1,000+ in Indiana, measured between internal points. The closest is Monroeville, 10.5 miles away, with 1,343 people.