Johnston, Iowa

Johnston population, 2020 to 2024

Johnston added 1,030 residents from July 2020 to July 2024, a change of +4.3%. In the latest year it moved by +424. Among 85 Iowa places of 5,000 or more, that growth ranks 20th; the median place changed by +1.1%. The median place of 5,000+ in Iowa has 9,511 people, so Johnston is 2.6 times that size.

Johnston covers 19.49 square miles of land and 1.48 of water, for 1,284 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Johnston is close to the typical town.

What county Johnston is in

All of Johnston's residents live in Polk County, which had 516,185 residents in 2024. Johnston holds 4.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Johnston

1 ZIP Code Tabulation Area (ZCTA) overlaps Johnston by at least 10% of the ZCTA's or the city's land: 50131. 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 Johnston is

The Census internal point of Johnston is at 41.692000, -93.724500. Des Moines, the capital, is 9.3 miles SE in a straight line. The nearest larger place is Urbandale, IA (47,759 people), 4.8 miles away. The nearest city of 100,000 or more is Des Moines, IA, 10.1 miles away.

Daylight in Johnston

At 41.69° N, Johnston gets about 15 h 12 min of daylight around the June solstice and 9 h 09 min around the December solstice, a swing of 6 h 03 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Johnston

The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Grimes, 4.1 miles away, with 17,266 people.