Oskaloosa, Iowa

Oskaloosa population, 2020 to 2024

Oskaloosa added 33 residents from July 2020 to July 2024, a change of +0.3%. In the latest year it moved by +50. Among 85 Iowa places of 5,000 or more, that growth ranks 50th; the median place changed by +1.1%. The median place of 5,000+ in Iowa has 9,511 people, so Oskaloosa is 1.2 times that size.

Oskaloosa covers 8.06 square miles of land and 0.02 of water, for 1,436 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Oskaloosa is close to the typical town.

What county Oskaloosa is in

All of Oskaloosa's residents live in Mahaska County, which had 22,034 residents in 2024. Oskaloosa holds 52.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Oskaloosa

1 ZIP Code Tabulation Area (ZCTA) overlaps Oskaloosa by at least 10% of the ZCTA's or the city's land: 52577. 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 Oskaloosa is

The Census internal point of Oskaloosa is at 41.292200, -92.640900. Des Moines, the capital, is 54.0 miles WNW in a straight line. The nearest larger place is Ottumwa, IA (25,648 people), 21.8 miles away. The nearest city of 100,000 or more is Des Moines, IA, 53.8 miles away.

Daylight in Oskaloosa

At 41.29° N, Oskaloosa gets about 15 h 10 min of daylight around the June solstice and 9 h 12 min around the December solstice, a swing of 5 h 58 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Oskaloosa

The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is New Sharon, 12.3 miles away, with 1,249 people.